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1985 Audi 80 1.6 Carb. Misfiring on one cylinder.

Misfiring on No.4 Cylinder. Runs smooth as butter when cold but starts to misfire when normal temp is reached. Less roughness at higher revs, almost normal when under heavy load. Pulled plug leads in turn to identify No.4 as culprit. Renewed Distributor cap, rotor, all plugs/ plugleads. No change. Tested cylinder pressures, all at 182 psi including no.4. I'm thinking in terms of a valve problem, but don't want to lift the head unless I have to. Have I missed anything ? (Sometimes you can be looking at the obvious and not see it !) Any suggestions?

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5 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: misfiring cylinders 2 and 5

fuel injectors?, fuel pressure? low compression? even vacum leaks can cause misfires,

Posted on Jul 06, 2008

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  • 77 Answers

SOURCE: My Audi A4 1997 1.8 Turbo is misfiring in the #2 cylinder. Changed the plugs and replaced the coil and still receiving the same code.

Check the wiring to the coil

Check to make sure the fuel injector is working properly.

Check compression on the cylinder

Posted on May 21, 2009

badealer888
  • 414 Answers

SOURCE: miss fire on cylinder 1 and 2 coils replaced

Get a scanner on it. You save time AND MONEY.

Posted on Jun 21, 2009

  • 1 Answer

SOURCE: Have multiple issues with the

4 cylinders misfiring? Did the new plugs and wires correct the problem? If so, for how long?
Was oil coming out of the cracked hose?
We Need more information in order to diagnose this problem.

Posted on Jan 25, 2011

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1 Answer

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

1 Answer

2002 saturn vue cylinder 1,3,5 misfiring when swapped coil pack it went away now cyl 2,6 misfiring.


having PO 304 = Misfire cylinder 4,PO 306 = Misfire cylinder 6, as I read above you have done the most. The thing that you have missed is to check whether the Catalytic Converter is faulty or not. To get an idea check whether you have a smell like rotten eggs at the end of the exhaust,you start having problems with cat and needs replacement. My advice before you go for a cat replacement is good to visit an MOT center and check your emissions and then you decide,

Aug 10, 2012 | Kia Rio Cars & Trucks

1 Answer

Missfiring detected in OLDSMOBILE intrigue 2002 3.5L


For engine misfiring problem check the help links mentioned below. Click the link below to go through the troubleshooting procedure :---- Engine misses and truck jumps? Hard to down shift? Issue with high gear only? http://technoanswers.blogspot.in/2012/02/engine-miss-and-truck-jumps-hard-to.html

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Bad miss at idle?

http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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Engine Misfire codes for car?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html
Engine Misfire codes?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html

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Misfire on cylinder 4?

http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html

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Oil on spark plugs and car misfires?

http://technoanswers.blogspot.in/2012/02/oil-on-spark-plugs-and-car-misfires.html

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This will help.

Thanks.

Jan 30, 2012 | 2002 Oldsmobile Intrigue

1 Answer

Have multiple issues with the 1998 Audi A6. It started running rough and the check engine light came on. Auto Zone checked it an said 4 cylinder were misfiring. Installed new plugs and wires and the same...


4 cylinders misfiring? Did the new plugs and wires correct the problem? If so, for how long?
Was oil coming out of the cracked hose?
We Need more information in order to diagnose this problem.

Nov 16, 2010 | 1998 Audi A6

1 Answer

Hesitation when cold, no power, sometimes runs relatively smooth. Backfires when pushing to floor. You can drive forever being gentle with gas pedal.


you have a misfire occurring is the check engine light on if so you need to do a code retrevial it may tell you which cylinder is misfiring or it may give you a po300 code which just says random cylinder misfire.if this vehicle has not been tuned and has several miles on it you would probably do well with tune up

Mar 19, 2010 | 2000 Nissan Maxima

3 Answers

Misfiring cylinders 2 and 5


fuel injectors?, fuel pressure? low compression? even vacum leaks can cause misfires,

Jun 22, 2008 | 1998 Audi A4

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