Question about 1996 Saturn SL

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Miss fire on 1 and 4

We have changed spark plug wires, spark plugs, ignition mod, coil, computer, map sensor, egr valve, compression checked good. still missing when you slow down. Sometimes low power going up hill.

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  • Saturn Master
  • 22,219 Answers

Saturn ? this is a 4 cyl 16v engine similar to the ones used in our opel range here in europe and these engines suffer from computer problems big time and your one is showing the classic signs,now look at the front pulley and see if their is a unused mounting on the top left side of the pulley where on older engines their would be a crank sensor with a toothed ring around the pulley and if so and yours has the sensor on the cylinder block rear flywheel end then disconnect this sensor and get one from the earlier model that fit at the front and connect it to the wires that go to the rear sensor ,now if its the same then reverse the two wires as this makes a difference and it should run as sweet as a singer sowing machine without a new computer which is bolted to the inlet manifold .If it is then unbolt it making sure it has a earth wire to the casing and pull it away from the manifold then install a small comptercooling fan to the casing with a couple of thick plastic ties and wire it in to the ginition circuit somehow .and make sure its supported away from the manifold to reduce the heat it gets and i promise this will work as i do about at least one a month of this type engine although mine are a bit later than this year but have a look and see if iam correct about the crank sensor .

Posted on Dec 31, 2012

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Posted on Jan 02, 2017

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SOURCE: 2002 1.9 sohc mp efi missing badly on #1 cylinder.

SOUND LIKE A BAD OR DIRTY FUEL INJECTOR.

Posted on Nov 13, 2010

dttech
  • 4803 Answers

SOURCE: 2003 saturn vue came in

You need to forget what you have already done...This is going to just mess with you. Pretend that you have never seen this vehicle before and start over with the codes. I gater from your description that you are dealing with a 3.0L Dual Overhead Cam V6.
I also gather that you are getting codes P0301, P0302, and P0305.

If I am "gathering" correctly, this places your problem on all the cylinders on the rear head. Check all your plugs and make sure they are gapped properly. Check to make sure that your injector connectors are plugged in. (You did say you had the heads off) Check to make sure that your coil connectors are plugged in. If you are sure that everything is plugged in properly, test coil pulse at each coil connector with a test light. Test for injector pulse at each injector. I have seen some of the Saturns with a separate connector for the rear-head coils and injectors. If this one is equipped with that, make sure it is plugged in properly. If this does not turn up the problem, retest your compression on the rear head. If the compression looks OK, go ahed anyway and recheck the valve timing. You could be one tooth off on the rear head and it won't be bad enough to affect compression during a cranking compression test, but enough to cause misfires with the engine running.

Don't fall into the trap of "I already replaced this" or "I know I did this right - no need to recheck". I have seen thousands of dollars worth of parts replaced unnecessarily due to this. CHECK EVERYTHING AGAIN! Like I said at the beginning of this, the best way to handle a problem like this is to pretend you are trying to figure this out for the first time. The only thing you know is that "someone" had the heads off. Other than that, you don't know anything.

If none of this turns up a suspect, post a comment to let me know.

Posted on Feb 04, 2011

emissionwiz
  • 76691 Answers

SOURCE: Cylinder 3 mifire, I have

Have you run a compression test of the engine? Have you confirmed you have spark at #3? Is #3 no more than 5% lower than the highest cylinder reading in PSI? ALWAYS run the basic tests before throwing parts at the problem. Also does the injector "pulse" and deliver fuel? When you pull the #3 Spark plug out after cranking the engine does it smell like gas?

Posted on Jun 06, 2011

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4 Answers

I have a 1996 chevy Corsica with a code PO300.I have tried many repairs and still cannot repair this code


code p0300 refers to random/multiple cylinder/s ---misfire detected=== causes spark plug/s--HT lead/s--injector/s---ignition coil/s--low compression --wiring
Seeing as you have covered all the electrics, now concentrate on the injectors and fuel pressures
If you will do all injectors and the fuel pressure is where it is supposed to be ( pressure test) then you will have covered all bases
Low compression will be in the one cylinder only ans will remain in that cylinder regardless of injector or plug changes
I would leave that to the last resort as if it is random, it may be a loose valve seat insert that moves randomly causing a compression problem

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I have a 94 chevy s10 with a misfire that's about to drive me crazy. I've changed plugs, wires, ignition coils three times with different types and brands no change. So I continued with the ignition...


If the compression test was good, that takes care of most mechanical things.
If you know for a fact the plug is firing under pressure, that leaves a vac leak or a fuel injector problem.
You didn't say what size the engine is or if it is MFI, so I will assume it is.
Depending on when the miss happens, it could be a vac leak, including the EGR valve, or an injector that is not getting a ground signal from the engine computer.
Do you know which cylinder is not providing power ?
Does it happen all the time, or only when the engine is under a load ?

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What are codes p1401 p0302 p0305 p1409 p0301


P1401 Differential Press Feedback EGR Circuit High Input
Your EGR port is plugged. Replace your EGR valve, and clean the ports
A code P0302 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer
  • A code P0305 may mean that one or more of the following has happened:
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    • Faulty fuel injector
    • Burned exhaust valve
    • Faulty catalytic converter(s)
    • Running out of fuel
    • Poor compression
    • Defective computer
    • A code P0301 may mean that one or more of the following has happened:
      • Faulty spark plug or wire
      • Faulty coil (pack)
      • Faulty oxygen sensor(s)
      • Faulty fuel injector
      • Burned exhaust valve
      • Faulty catalytic converter(s)
      • Running out of fuel
      • Poor compression
      • Defective computer
      • A code P0302 may mean that one or more of the following has happened:
        • Faulty spark plug or wire
        • Faulty coil (pack)
        • Faulty oxygen sensor(s)
        • Faulty fuel injector
        • Burned exhaust valve
        • Faulty catalytic converter(s)
        • Running out of fuel
        • Poor compression
        • Defective computer
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2003 Dodge Caravan 3.3 backfires


Do you have exhaust leaks before the exhaust converter?

Do you have a blocked exhaust converter?

Did you test the upstream O2 Sensors?

Did you check fuel pressure at the motor?

Are the wires on correctly?

Is the EGR Valve stuck open

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My husband did a tune up on my car yesterday and now it wont start it will turn over like it wants to start but it wont he said that its miss firing we have bought 3 new coil packs and still will not start...


If your car is miss firing and your husband changed the coil packs,the wires leading from coil packs to sparkplugs must have got crossed.This will change car timing which will result in the car miss firing.He needs to go over wiring and correct problem for car to run right.You can go online to autozone.com and type in Info about car to get the correct wiring layout.Your problem isnt the new plugs n wires.Its the wiring layout.

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#1 plug is miss-firing.I have replaced plug and wire,but keeps miss-firing only on#1 plug.have been told that coolant is possibly getting in #1cylinder.also I have been told #1 coil could be bad.witch is...


Could only be a few things. The coil #1, Fuel injector #1, Stuck intake or exhaust valve, or blown head gasket allowing coolant into cylinder #1. Use a spark tester to check the spark coming out of cylindr #1 if checks good then ohm test the injector when it is warm. Check other injectors to compare. Do a compression test on cylinder #1 and test other cylinders to compare. If cylinder is low compression suspect valves and or head gasket. If compression is low then het a leak down tester to test if a valve is broke or sticking. On your sable i would suspect injector or coil most likely.

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I changed all three coils and plugs and wires. I also verified the correct firing order as well as the plkug placement. the engine will turn over and hit but will not idle or accept throttle ,after several...


You changed coils, plugs n wires, but did you check if you have spark? your ignition module could be faulty. Don't forget to clean or replace plugs before trying something else and while you'r at it check your firing order one more time.

Also check for:

Vacuum leaks, uneven or low cilinder compression, ignition timing, dirty air filter, spark plug gap, idle air control selenoid sticking, EGR valve stuck open and faulty map sensor.

I am curious on how all this started!! When was the last time the car ran fine?

Good Luck buddy!!

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Mis fires have changed spark plugs spark plug wires and ignition control module


Please describe miss fire? or do you mean it has a miss? cross fire occurs when plugs are firing before or after they are supposed to if it's missing then that's another issue could you please give more detail?

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99 Daewoo Leganza DTC P0301


When the misfire monitor detects a misfire, it will trigger the check engine light with the specific cylinder number as the last digit in the P030X code. For instance cylinder 1 misfire is P0301, cylinder 2 is P0302 etc.

The misfire detection monitor, a software strategy built into the computer, is designed to detect an engine misfire. The computer can also normally identify the specific cylinder in which the misfire has occurred. A misfire is nothing more than a lack of combustion, which can be caused by poor fuel quality or metering, low compression, lack of spark or unmetered air entering the engine. There are other possible, less obvious causes as well, such as uncommanded Exhaust Gas Recirculatin (EGR), flow.



P0301:

Possible Causes:
Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

P0302:

Possible Causes:
Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

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1 Answer

Honda Misses.


Pin point the dead hole and check that injector.

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