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02 Cavalier 2.2l dohc - 'misfires' under hard acceleration, no codes


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estranger
Novice

May 12, 2010, 3:05 PM

Post #1 of 8 (1876 views)
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02 Cavalier 2.2l dohc - 'misfires' under hard acceleration, no codes Sign In

Year: 2002
Make: Chevy
Model: Cavalier
Engine: 2.2l DOHC
Eng Code: F
Trans: Manual
Miles: 74,500

Hi!
I am by NO means a 'car guy' but I am learning and enjoy working on my vehicles. I have been trying to fix this problem I have had with my car for about a year now. The car drives fine if I drive it normally, but if I accelerate hard the engine runs VERY rough. If I have the car parked and out of gear and apply the gas slowly it revs up very smoothly and sounds good. If I hit the gas hard (not even flooring it) the engine shakes and pops and does what I would describe as a misfire as it revs up, but I do not get any ODB-II codes. When I let off the gas pedal I hear some popping from my exhaust pipe as the RPMs drop to idle, but then the car idles nice and smooth.

Since the problem I have replaced my spark plugs, wires, air filter, and MAP sensor (after reading about similar problems with 02 cavaliers being the MAP sen). I have tried a bottle of fuel injector cleaners a few times but with no effect. At this point I have exhausted my knowledge and resources and hoping someone here can give me a hand. What can I look at next? Is there any more information I can provide that can help? Thanks in advance!

Oh, my car has passed inspection/emissions testing twice since the problem started (Pennsylvania), if that helps rule anything out.

-Russ


nickwarner
Veteran / Moderator


May 12, 2010, 6:50 PM

Post #2 of 8 (1858 views)
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Re: 02 Cavalier 2.2l dohc - 'misfires' under hard acceleration, no codes [In reply to] Sign In

check fuel pressure.might be low


estranger
Novice

May 17, 2010, 1:15 PM

Post #3 of 8 (1840 views)
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Re: 02 Cavalier 2.2l dohc - 'misfires' under hard acceleration, no codes [In reply to] Sign In

I am having a hard time finding what my pressure reading numbers should be. My repair manual doesn't list my exact engine. It lists the 2.2 OHC and 2.4 DOHC but not the 2.2 DOHC and they all have different proper readings.

Where can I find this out? I must be googling the wrong words because I can't even find it there :)


Hammer Time
Ultimate Carjunky / Moderator


May 17, 2010, 2:07 PM

Post #4 of 8 (1834 views)
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Re: 02 Cavalier 2.2l dohc - 'misfires' under hard acceleration, no codes [In reply to] Sign In

If it's fuel pressure that your looking for, here it is

Fuel Pressure 50 - 60 psi KOEO (Key On Engine Off)




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



estranger
Novice

May 17, 2010, 2:52 PM

Post #5 of 8 (1830 views)
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Re: 02 Cavalier 2.2l dohc - 'misfires' under hard acceleration, no codes [In reply to] Sign In

Thank you! I will hopefully be able to test the fuel pressure after work today, and see what I find.


estranger
Novice

May 18, 2010, 8:53 PM

Post #6 of 8 (1819 views)
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Re: 02 Cavalier 2.2l dohc - 'misfires' under hard acceleration, no codes [In reply to] Sign In

OK, finally got to test the fuel pressure (thank you rain!).

At KOEO the PSI shot right to 60, and after about 10 minutes it slowly dropped to 52PSI.
When I idled the engine it shot back up to 60PSI and holds steady.
When I rev the engine up with the throttle cable the PSI doesn't move from 60.
When I disconnect the Fuel Pressure Regulator vacuum tube (as per repair manual) the PSI doesn't move from 60.

Possible bad Fuel Pressure Regulator?


(This post was edited by estranger on May 18, 2010, 9:33 PM)


estranger
Novice

May 26, 2010, 8:02 AM

Post #7 of 8 (1798 views)
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Re: 02 Cavalier 2.2l dohc - 'misfires' under hard acceleration, no codes [In reply to] Sign In

Well, no change after I replaced the fuel pressure regulator (and fuel filter for good measure). I am not sure where to go from here, besides to a mechanic, unless someone has any other ideas for me to try.

Even if I didn't fix the problem, I sure learned a lot by trying.


Hammer Time
Ultimate Carjunky / Moderator


May 26, 2010, 8:38 AM

Post #8 of 8 (1794 views)
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Re: 02 Cavalier 2.2l dohc - 'misfires' under hard acceleration, no codes [In reply to] Sign In

Your problem sounds like a pretty clear misfire under load. Usually the first things to look at are the plugs and wires. If they are eliminated and known good, the coils are the next thing in the circuit to cause that but it would be much easier if you could identify which cylinders have the problems. Looking at the color of each plug may help do that.
If the ignition system gets eliminated, then you have to look at fuel injectors. I'm not saying to just replace all this stuff. It needs to be tested.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.





02 Cavalier 2.2l dohc - 'misfires' under hard acceleration, no codes


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