Question about Chevrolet Cavalier

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No spark on # 4 cyl on initial start up.after engine gets up to temp # 4 cuts in &runs normal.has new plugs and wires and replaced coil didn'nt solve problem.has anyone had same problem?

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If you are using a copy key you made from a key maker,it doesnt have the factory diode and that would do it.there are 5 different diodes,ask a gm parts person at any certified dealership.hope this helped,wallace

Posted on Jul 26, 2009

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Posted on Jan 02, 2017

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Initial start up the engine sounds like its running on 2 cylinders under powered intil the temp gauge reads normal ???? any body got the answer please


Cold starting misfires can often be caused by either tired high tension spark plug leads or ignition coil packs. If replacing leads, then replace with a full, new set. Coils can be changed individually, but it is often the case that if one has failed, then the others aren't far behind. Some cars have individual coil packs on each spark plug. Some cars have a single pack for all plugs and some have coil packs which may control two or more plugs.

To check for a misfire (ignition failure) follow these steps:

(Cold start) (Use a pair of insulated pliers)

1) Start the vehicle

2) When the vehicle starts misfiring, disconnect plug leads or coil pack connections one at a time. If the vehicle idles even more roughly, then that plug or pack should be considered fine.
Replug each connection before disconnecting the next one. Once you disconnect a plug lead or coil pack connection and find no difference in poor engine running, then you have likely found the offending cylinder. Check the spark plug condition, lead and/or coil condition and connections on that cylinder.

3) Replace components as necessary.

Oct 12, 2014 | Cars & Trucks

2 Answers

Jeep 3.7 cylenders 2 & 4 not firing


3.7 V6, mileage?

most likely the HV wires bad.

then bad coil pack.

did you check spark directly at the coil pack?

i use 2 known good HV wires to do that and 2 good test spark plugs.

both plugs grounded to engine (shell)

that is how you test any wasted spark coil pack. 3 coil pack.

if that fails the FSM shows, unplugging it and check the coil resistances. if wrong the pack is bad,

keep in mind the res. can read ok and coil be bad ,due to internal insulation break down (internal shorts)

if thats ok. the resistance , make sure the wires are not (primary)

to the coil (the low voltage connnector)

if that is ok, its mostly likely a bad coil, (pray not bad PCM)

if tool-less? start with cheap parts , work to expensive. (guessing)





now wasted spark 101.

if one line opens , both spark plugs die. no spark

the wasted spark is wired in SERIES. ( like Christmas lights)

the magic cuts cost of 6 coil\'s.

so if the HV wires are say, cheap , carbon wire and open

you lose, both spark plugs. use MAG wire and end this issues.

get some nice NGK mag wire or Bosch Mag wires.

you can see i hate carbon wire. for good causes.

(carbon string wire)

mag wires is real wire that is coil spun and is inductive. it

has the correct impedance but is not a resistor its and inductor.

and lasts the longest , and worth every penny.

Mar 29, 2014 | 2006 Jeep Liberty

1 Answer

94 Toyota Corolla engine problems


Take a compression test on # 4. It may be a little oil burning w coolant getting by the head gasket. POSSIBLE faulty injector or not firing on time. Ck for any oil in the anti freeze or anti freeze in the oil.

Mar 04, 2017 | 1994 Toyota Corolla

2 Answers

Code po304 car wont start


cylinder 4 misfire ,now if this is a GM product then i think you may need a reconditioned ECU init as if this is the 4 cyl engine and its same as the opel astra and zafiro and the vectra then its a common fault with a 2000 to 2004/5 model the computer is bolted to the engine inlet manifold and very weak and susceptable

Feb 06, 2012 | 1996 Saturn SL

1 Answer

Replace spark plugs in 1997 4 cyl. ford ranger


Hello, I will suggest you get these few tools before you with the replacement.
(1) Spark plug socket with rubber insert to hold plugs in place while inserting & removing.(2) 6inch extensions for your 3/8ths inch socket wrench,(1) Swivle Socket extension for your 3/8ths inch socket wrench.(1) 1/2inch socket for exhaust manifold screws. A little quantity of anti-sieze for the spark pluggs to be applied to the pluggs if they are proving difficult to get out.
Start with the 1st cylinder at the front of the engine on the passanger side.
STEP 1.
Twist & remove the spark plug boot from the existing plug.
STEP 2.
You have to use a very small flat edged screwdriver to open the clips that hold the plug wires together.
STEP 3.
Use a 6" extension & a 3" extension & your deep socket for the spark plug.
STEP 4.
Remove the first plug and replace the old plug with a new Bosch Platinum Plus 2 prong plug and use some anti-seize on the threads and tighten to the appropriate torque.
STEP 5.
Remove the old plug wire from the coil pack. It will be going to the 2nd coil pack (located to the rear of the first coil pack) and install the new plug wire in the coil pack.
STEP 6
Repeat steps 1-7 for plugs on 2 & 3.
STEP 7.
To remove Plug #4 which is the last plug on the passanger side,you have to remove the two (2) 1/2inch bolts that holds a bracket to the exhaust manifold. Make sure you spray the studs these bolts are on with some DW-40 or liquid wrench. The exhaust manifold studs might have a lot of rust & being difficult to turn nuts off without shearing off the stud. It has some sort of aluminum box ontop of this bracket with some sensor wires coming out of it, Slip the bracket off and simply lay it to the rear of the engine to provide better access to this last cylinder.

STEP 8.
Repeat steps 1-7 for plug #4 and then Remount bracket containing the aluminum box with sensor wires.

Upon completion of the passenger side,you now have to proceed to the driver side.
STEP 1. The first cylinder at the front of the engine the spark plug wire has a grey handle sticking up next to the A/C compressor. Using some pliers (needle nose plier) twist & pull this grey handle. The spark plug boot should pop out.

STEP 2.
With the help of the small flat edged screw driver, unhook the spark plug wire clips that hold the wires together. There are 3 - One just after the 1st coil pack located at the front of the engine, another just on the other side of the valve cover and a small 2 clip located about 1/2 way back on the valve cover under the intake manifold.
STEP 3.
Remove the spark plug wire from Cylinder #1 on the Drivers side
STEP 4.With the help of the small flat edged screw driver,press the 4 connection points on the grey handle that is attached to the wire,it will separate down the middle and allow you to remove the wire, Replace the wire with the new wire,you have to ensure you line up the rubber round plugs with the round holes in this grey handle & snap it back together with the new wire in place.

STEP 5.
Hold the spark plug socket in your left hand down near the plug,feed a 6" inch extension below the A/C Compressor line (black pipe) and the A/C Compressor with your right hand and attach the spark plug socket into the extension.
STEP 6.Slip the socket onto the plug,afterwards,attach an additional 3 or 6 inch extension to the existing extension & attach your socket wrench.
STEP 7.Remove the plug & proceed to replace it with a Bosch Platinum plug & anti-seize on the threads. Feed the new Spark Plug wire over to the 1st coil pack & replace it on the coil pack.

Jul 05, 2011 | 1997 Ford Ranger SuperCab

1 Answer

2006 dodge caravan, 6 cyl. relaced cole, sparkepugs and wires in oct. 2009. Engine is reading #2 cyl. misfire again. Why


Firts time swap spark plug & ignition coil between two different cylinders and read again if the same #2 cyl. misfires !
If #2 cyl. is OK and another cyl. misfires then spark plug or ignition coil is out of order and must be replaced.
If #2 cyl. misfires again then #2 injector must be checked !
If ignition coils & spark plugs (complete set for 6 cyl.) are replaced then you must check #2 injector !

Mar 15, 2010 | 2006 Dodge Caravan

2 Answers

Missfire # 5 cyl before and after plugs and wires ?I changed some vacume hoses still same what to ck nexed


i had that happen plenty of times. be sure that the new plug isnt bad and ohm test or see if you haave spark on the new wire. good luck

Jan 07, 2010 | 2001 Ford Explorer Sport

1 Answer

#4 cyl has no spark on initial start 10-15 mins later #4 cyl cuts in and engine runs normal. replaced s plugs,wires coil.


on a cavalier it usually is a problem on the wiring harness which could have a loose fitting to the actual connection to the spark plug boot to cylinder 4. check that ok?

Jul 26, 2009 | 1993 Chevrolet Cavalier

1 Answer

Dead cylinders 2003 sebring


it sounds like you may have the wires on the wrong coil. It should be #1 on the #4 coil, and the #3 wire on the #2 coil. you probably have them backwards so 1 and 3 are firing on the exhaust stroke.
the firing order is 1-3-4-2.
they should be hooked like this.
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Jan 23, 2009 | 2003 Chrysler Sebring

2 Answers

Daewoo lanos 2000 car is misfiring and wont run properly firing on cylinders 1 and 4 misfiring


have you changed the ignition wires? perhaps firing order crossed? if not coil pack or ignition wires faulty how do you know it is not "FIREING" on 1 & 4 have you tested it with a spark tester tool???

Dec 23, 2008 | 2000 Daewoo Lanos

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