o/t 1995 chevy cavilier running rough

Anonymous-0

Well-known Member
my wifes car she bought new in 1995 , has 223000 miles, is a 5 speed. it wants to spudder and miss while trying to cruise at a steedy speed. at 55 mph in 5th it misses , but speed up it runs fine. i have replaced plugs and plug wires. replaced throttle potition sensor. ran a bottle of seafoam .tried dry gas/and different fuel injector cleanersits got pleanty of power, it just can mantain a constant speed. the checkk engine light only comes on when it starts to miss but has no codes stored on the computer any ideas? i hate to just start randomly start replaceing parts.
 
Ignition coil. May just need a new coil assembly. Make sure the #1 and #4 plug wires are in the correct place in the coil. If they are switched it can make it run with problems. Don't know how it can tell since the same coil fires both plugs at the same time. There was a service bulletin about this a few years ago for several GM cars with the small 4 cylinder engine.
 
My 99 Nissan Frontier did that and it was the EGR valve. Getting up to speed was fine. Running 55 and trying to hold it the truck would shake. I first thought I had a tire out of balance. Hard to hear those 4 cylinder engine. Accelerate and engine runs fine.

The Nissan has a tube with threaded plugs in it. I took one out, filled it with sea foam while the engine was hot. Let it sit over night. Didn't see much change but in a few weeks it was back running fine. The sea foam made lots of carbon come out the exhaust for about a mile too.

You may have another problem but it sounds like EGR.
 
(quoted from post at 09:09:16 06/22/13) my wifes car she bought new in 1995 , has 223000 miles, is a 5 speed. it wants to spudder and miss while trying to cruise at a steedy speed. at 55 mph in 5th it misses , but speed up it runs fine. i have replaced plugs and plug wires. replaced throttle potition sensor. ran a bottle of seafoam .tried dry gas/and different fuel injector cleanersits got pleanty of power, it just can mantain a constant speed. the checkk engine light only comes on when it starts to miss but has no codes stored on the computer any ideas? i hate to just start randomly start replaceing parts.

at a steady speed. at 55 mph in 5th it misses,, If I had to guess my money would be on a ignition miss-fire,,, go after the coils...
If its a 2.2 theirs 2 of'em if a 2.3 its a assy.... You said it had wires I would think its a 2.2...

If you want to play and have this type of coil pack its basically the same as yours...




http://easyautodiagnostics.com/gm_3800_coilpack/coil_pack_test_1.php

It can not be stressed enough to use the correct spark tester not only on HEI on any ignition system...

Its worth the extra buck are 2 to go with BWD "Select" E51 coils. They are not OEM and I like OEM but have gave me good service. I would use OEM plugs (AC's, denso's are even NGK's NUTTIN else) and Napa Belden are AC delco plug wires. If you have anything else in it when it came to me it would get swapped out even if it did not fix it I am not going to chase my tail because someone were to cheap to buy quality parts....
 
I have a 1997 Cavalier that developed missing when taking off from a stop. I replaced many of the things mentioned by you and others. Mine was also using more gas than it should have. The culprit turned out to be the fuel pressure regulator had gone bad. It's not to hard to replace and is not all that expensive. Mine ran great after that. Just another place to look for a possible solution.
 

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