Question about 1996 Pontiac Firebird

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1999 pontiac firebird 3.8l misfire on cylinders 1, 3, 5. New coil packs, injectors , iac, iat, map, maf, tsp, crannk position sensor and reluctor wheels, cam position sensor, plugs , wires, smoke test

New: 3 coil packs, 6 injectors , iac, iat, map, maf, tsp, crank position sensor and reluctor wheels, cam position sensor, 6 spark plugs , wires, smoke tested no leaks found. FUEL PRESSURE 45 psi at koeo. 38 psi at 3000 rpms. Coolant temp at start up 70F, Intake air temp 71F, ambient temp 73F. goes too closed loop temp at 170F.

Posted by johnfaires on

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Jeff Armer

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  • Pontiac Master
  • 15,575 Answers

Engine compression .

Posted on Nov 18, 2017

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Anonymous

  • 81 Answers

SOURCE: cylinder 3 misfire

Make sure you're using the recommended spark plugs. When my car did that, I had put Bosch Platinum Plus-4 plugs in and got that same problem. Turns out the plugs are too hot and cause it to fire prematurely and kick the misfire code.

Posted on Jul 24, 2008

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Anonymous

  • 6 Answers

SOURCE: 1996 Pontiac Bonneville Misfire

Change spark plugs and wires

Posted on Mar 19, 2009

Anonymous

  • 1 Answer

SOURCE: service engine soon light keeps coming on. Now low coolant light

I would start by doing an oil change myself so you can examine the oil and look for water/antifreeze in it. You will be able to see it separate from the oil and you can smell the antifreeze. If there is then you have a leak between the water jacket and the heads somewhere. More than likely the LOWER intake gasket is leaking into the head. You said they replaced a gasket but was it the UPPER or LOWER? If it was the LOWER did they use RTV in the correct areas? Did they torque the intake bolts to the correct pressure and install the bolts correctly? I know you don't have these answers but these could all be part of the problem. It may be leaking more at #2 cylinder and causing it to foul more than the others. Also just because a mech pressurized the coolant system and didnt see any change in pressure (hopefully he wasn't just looking for visible leaks) the issue may not happen until the engine is hot, as metals behave differently when heated, especially aluminum which the LOWER intake is made. Have a mechanic or mechanically inclined friend (gearhead) remove the #2 plug wire, then kick the engine a few times without starting it, enough to let any fluid get into the chamber, this would include gas btw. Then remove the plug and look for any wet residue on the plug, gas will evap. quickly, antifreeze/oil won't. again try to smell the residue and if necessary, lightly touch some to your tongue, antifreeze has a sugary sweet taste that is easily detectable. Remember any time you are working with chemicals such as waste oil and especially anti freeze, minimize spills and clean them up quickly and completely and place the spent fluid in a sealable container and take them to a collection center for disposal. Waste oil is a carcinagin (cancer causing) agent and antifreeze (glycol) new or old will kill any animal (child, dog, cat,etc) that ingests it. Many auto parts stores and some other retailers that sell oil and antifreeze will take your wastes if you bought the replacement fluid from them, check before you buy.

Posted on Apr 04, 2009

Anonymous

  • 1 Answer

SOURCE: 2001 Firebird 3.8 misfires

Check your alternator see if you have a drop in voltage on your tack,then it is the problem.I too was a victim of high price tune up and still had a problem with a misfire.and cover your coil pack with a piece of rubber water run of onto your power pack .Another thing is to use a silicone spray on all wires.

Posted on Jun 11, 2009

Anonymous

  • 165 Answers

SOURCE: 1999 pontiac grand prix gtp won't start

well from what it sounds like is that it is your fuel injectors try going to a full service garage and have them clean the fuel injectors if you cant get it there go to auto zone and pick up a can of sea foam and do it your self thru a vacum line such as the brake booster there is a vacum line that comes out of that and goes straight to your cylinder that will help you there its recomended once a year or every 15000 miles good luck hope it works for you

Posted on Jul 06, 2009

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87 celebrity 2.8. cranks but dies within seconds i replaced the I.A.C. fuel pump fuel press. reg. fuel filter plugs wires air filter upper intake gaskets coil packs, and the gas cap.


Will it keep running if starter fluid is sprayed into a vac hose when it's started? If not it's a spark problem.
If it does keep running then it is lacking fuel.
Remember,the fuel pump runs off power from the oil pressure switch once you use up the fuel from the "prime cycle" when you first turn the key on.

Feb 26, 2018 | 1987 Chevrolet Celebrity

1 Answer

05 MERCEDES C230 KOMPRESSOR CRANK NO START, HAS NEW CRANK ANG LE SENSER, HAS NEW CAM POSITION SENSER NEW PCV ALL AROUND. ODB CODE READS LEAN ON BANK ONE/ LEAN ON 1&3. ANY ADVISE IS HELPFUL


check the spark plug and coil pack. swap 2&4 coil pack with 1&3.
to see if the fault moves.

otherwise its a bit of guessing game without the dealer read out.

lean mix can be injector, coil, spark plugs, o2 sensor, camshaft sensor/adjustor, low compression due to valves, head gasket or piston rings.

idly if it start drive it, if possible, and see what additional faults appear.

Jan 12, 2018 | Mercedes-Benz C-Class Cars & Trucks

1 Answer

My 2001 Malibu has 3100 engine..turns over but not firing but getting gas..replaced crankshaft censor,camshaft censor,ignition control module,coil packs and theft light is not on.


Did you check for battery positive voltage at the pink wire at the ignition module , you have three connectors ,one with 4 an two with two wires , the one with pink an black ,that's power an ground . is there power an ground ? Which crankshaft position sensor did you replace , yours has two ! crank sensor A an crank sensor B . A is an input to the PCM - engine computer , B is an input to the ignition module .Does your check engine light come on when you turn on the key ? an go off when you crank the engine ? You tested for spark at the coil ? Pull two pull wires on same coil an crank over the engine , is there spark jumping from one terminal to the other ?
Engine Cranks But Does Not Run
Inspect for the following conditions:
?€¢
Mass air flow (MAF) is compared to a calculated mass air flow based upon the manifold absolute pressure (MAP), throttle position (TP), and engine RPM readings. A skewed or unresponsive MAP sensor at KEY ON will cause the predicted air flow value to be inaccurate. Compare MAP and TP sensor value to that of a known good vehicle.


?€¢
A faulty engine coolant temperature (ECT) sensor. Compare the ECT with intake air temperature (IAT) on a completely cool engine with a scan tool. The ECT should be within 3?°C (5?°F) of the IAT. If not, refer to DTC P0128 .


You need a scan tool to check this stuff !
1
Did you perform the Diagnostic System Check-Engine Controls?
--
Go to Step 2
Go to Diagnostic System Check - Engine Controls

2

  1. Turn ON the ignition, with the engine OFF.
  2. Observe the DTC information with a scan tool.
Does the scan tool display DTC P0101, P0123, P0230, P0601, P0602, P1626, P1630, or P1631?
--
Go to Diagnostic Trouble Code (DTC) List
Go to Step 3

3

  1. Turn ON the ignition, with the engine OFF.
  2. Inspect the following fuses for an open:
?€¢
F/P INJR


?€¢
ELEK IGN


?€¢
F/PMP

Did you find an open fuse?
--
Go to Step 10
Go to Step 4

4

  1. Attempt to start the engine.
  2. Monitor the engine RPM parameter while the engine is cranking with a scan tool.
Does the engine RPM parameter display cranking RPM?
--
Go to Step 5
Go to Electronic Ignition (EI) System Diagnosis
  1. Monitor the Cylinder 1-6 Injector Circuit Status parameter with a scan tool.
  2. Crank the engine.
Do all of the Cylinder Injector Circuit Status parameters display OK?
--
Go to Step 6
Go to Fuel Injector Circuit Diagnosis

6

Command the fuel pump ON with a scan tool.
Does the fuel pump turn ON?

Aug 20, 2015 | Cars & Trucks

1 Answer

I need to replace a camshaft sensor in a 99 silervado where is it


Easy one.

1)Disconnect negative battery cable
2) Disconnect spark plug wires and ignition coil wire from distribtor
3) Disconnect CMP (cam position) sensor harness connector from the distributor.
4) Remove distributor cap screws.
5) Remove distributor cap
6) Remove rotor screw
7) remove rotor
8) Align the square slot in the reluctor wheel with the CMP sensor.
9) remove CMP fasteners, then remove CMP.


WHEN INSTALLING:
  1. Align the square slot in the reluctor wheel with the CMP sensor.
  2. Insert the CMP sensor through the reluctor wheel slot.
  1. use new mounting screws for the sensor!!


good luck have fun...remember if you don't think you can do it, It's better to take it to a shop than to destroy an entire engine.

May 01, 2011 | 1999 Chevrolet Silverado 1500

1 Answer

My '01 impala 3.4 v-6 flat spots when COLD, at around 20mph. the idle is ruff with random misfires. acceleration is overall poor. when HOT, most symptoms go away leaving only some slight acceleration...


depending on mileage, but possible tune-up could fix it. if already done then check ignition coil pack and ignition wires also spark plugs, check vacuum hoses for leaks or porous, last injectors clogged - use some techron fuel injector cleaner (wal-mart has them). Also get the throttle body and iac valve cleaned by throttle cleaner . Also this other possibilities are to be checked and confirmed.:---- Engine running rough or misfiring can be cause by the following:

1.Defective spark plugs
2.Inadequate spark/coil, defective spark plug wire.
3. Lack of compression
4.False air leakage.
5. Faulty fuel injectors.
6. Insufficient fuel pressure.
7. Contaminated fuel.
8. EGR valve that is leaking.
9. Oxygen sensors.
10. Throttle position sensor.
11. Manifold absolute pressure sensor
12.Mass Airflow Sensor
13.Idle air control valve

--------- This should help.Keep updated.Thanks.Helpmech.

Mar 27, 2011 | 2001 Chevrolet Impala

2 Answers

I also have a 2003 2.2L ecotec manual transmission.I have changed plugs,coil,map sincer,still have a misfire problem,i think somthing is wet inside but what that might be i don't know.Any suggestions


I worked on another fuel injected vehicle and found that it had an injector problem which had caused the check engine light to com on telling me that I had a random misfire.I did the same as you did and changed the knock sensor ,the crank position sensor and the cam position sensor only to find out that is was a distributor and injector problem.I would recommend that you test your cam and crank sensor and make sure that they are working properly And if the sensors are good then I would check my fuel system including the injectors to make sure there are no bad ones.

Feb 14, 2011 | 2003 Chevrolet Cavalier

1 Answer

1998 saturn sc2 po341


P0341 - Camshaft Position Sensor Circuit Range/Performance

This P0341 code basically means that the powertrain control module (PCM) detected a problem with the camshaft signal. The camshaft position sensor (CPS) sends a specific signal to the PCM for Top Dead Center on the compression stroke as well as signals indicating the position of the cam sensor. This is accomplished through a reluctor wheel attached to the camshaft that passes by the cam sensor. Any time that the signal to the PCM is inconsistent with what the signal should be, this code is set. NOTE: this code can also be set by extended cranking periods.

Symptoms: The car will likely run with this code set, as it is often intermittent and also because the PCM can often operate the vehicle in "limp-in/limp-home" mode even with a cam sensor signal problem. There may be no noticeable symptoms other than:
* Poor fuel economy (if engine runs)
* Possible no start condition


Causes: A code P0341 may mean that one or more of the following has happened:
* Cam sensor wiring routed too close to spark plug wiring (causing interference)
* Poor wiring connection at cam sensor
* Poor wiring connection at PCM
* Bad cam sensor
* Damaged reluctor wheel

Possible Solutions: Often relacing the sensor fixes this code, but not necessarily. Therefore it's important to check the following:
* Check that the wiring isn't routed too close to any secondary ignition components (coil, spark plug wires, etc.)
* Visually inspect the wiring at the sensor for any burn marks, discoloration indicative of melting or chafing
* Visually inspect the cam sensor for damage
* Visually inspect the reluctor wheel through the cam sensor port (if possible) for any missing teeth or any damage
* If reluctor isn't visible from outside the engine, visual test can only be done by removing cam shaft or intake manifold (depending on engine design)
* If all checks out okay, then replace the sensor.

Related Camshaft Trouble Codes: P0340


Hope helps (remember to rate this answer).

Jan 03, 2011 | Saturn SC2 Cars & Trucks

1 Answer

Where is the cam sensor located


Removal & Installation 2.2L Engine To Remove:
  1. Lift the vehicle.
  2. Remove or disconnect the following:
    • Right wheel and tire assembly.
    • Camshaft position (CMP) sensor electrical connector. gm_truck_s10_cmp.gif

    • Bolt and CMP sensor.
To Install:
  1. Install or connect the following:
    • Camshaft position (CMP) sensor and bolt.
      1. Torque to: 7 ft. lbs. (10 Nm)
    • CMP sensor electrical connector.
    • Right tire assembly.
  2. Lower the vehicle.
4.3L Engine To Remove:
  1. Remove or disconnect the following:
    • Spark plug wires and ignition coil wire from the distributor 4.3L Distributor CMP electrical connector gm_trk_sil15_02-04_43_dist_cmp_elect_conn.gif

    • Camshaft position (CMP) sensor harness connector from the distributor
    • Distributor cap screws 4.3L Distributor cap removal gm_trk_sil15_02-04_43_dist_cap_rem.gif

    • Distributor cap 4.3L Distributor rotor screws removal gm_trk_sil15_02-04_43_dist_rotr_screw_rem.gif

    • Rotor screws
    • Rotor
    4.3L Align reluctor wheel slot with CMP gm_trk_sil15_02-04_43_algn_whl_slot_cmp.gif

  2. Align the square slot in the reluctor wheel with the CMP sensor 4.3L CMP sensor screws removal gm_trk_sil15_02-04_43_cmp_sensr_screw_rem.gif

  3. Remove or disconnect the following:
    • CMP screws 4.3L CMP sensor removal gm_trk_sil15_02-04_43_cmp_sensr_rem.gif

    • CMP sensor
To Install:
NOTE: Do not use the old cap, CMP sensor, and rotor screws. Use the replacement screws that have been coated with a thread locking compound.
  1. Insert the CMP sensor through the reluctor wheel slot
  2. Install or connect the following:
    • New CMP mounting screws and tighten the screws
      1. Torque to: 19 inch lbs. (2 Nm)
    • Rotor onto the reluctor wheel
    • New rotor screws and tighten the screws
      1. Torque to: 18 inch lbs. (2 Nm)
    • Distributor cap
    • New distributor cap screws and tighten the screws
      1. Torque to: 21 inch lbs. (2.4 Nm)
    • CMP sensor harness connector
    • Spark plug wires and ignition coil wire
  3. Test drive the vehicle to confirm the repairs
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Aug 17, 2010 | 2000 GMC Jimmy

2 Answers

1996 Jeep Grand Cherokee No Start


I would be thinking that there is a good chance that you need to be checking out replacing the computer, if you aren't getting any communication with the proper scan tool then the computer isn't communicating with anything in the vehicle...... I would have guessed first off that the ignition control module might be bad but that is obviously part of the computer also, I would be looking in that direction.

Sep 19, 2009 | 1996 Jeep Grand Cherokee

1 Answer

My 1998 ford escort won't get sprk through cylinder 1 and 4


Make sure cam and crank sensor are active. pcm must see these signals before allowing primary part of coil pack to energize. crank sensor will be possible suspect,usually located on engine to bell housing. flexplate or flywheel is the reluctor wheel or like a shutter wheel for the sensor to identify the position of crank for spark delivery. see if you have voltage at harness to coilpack with key on? if not you have another problem.

Jul 14, 2009 | 1999 Ford Escort

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