My car is running rough and acts like it is missing at times, running very rich on fuel!

135

Asked by May 12, 2013 at 10:52 PM about the 1997 Chevrolet Cavalier Z24 Coupe

Question type: Maintenance & Repair

I have a 1997 cavalier Z-24 racecar. We installed new plugs into the car before starting the season. We noticed that the car had what seemed like a misfire and was running rough and smoking. It was running very rich. The car has an aftermarket inline pump that is pulling from a fuel cell with clean gas. We have replaced the fuel pressure regulator with no change in the engine. I have also swapped to another set of plugs and after 30 minutes of running the car they were blackened. I have checked the system for codes and there are none on the car. I also removed the air idle control valve and cleaned it up. It acted like it helped but then the car went right back to running bad. I have not messed with the map sensor or the tps. The car has just one o2 sensor on it the other one has been replaced with a resistor. I have cleaned the throttle body and that also helped it a little. I think my next check is going to be the map sensor. Does anyone have any ideas as to what else could be used.

5 Answers

97,035

Here's a thread about a race car that was blowing blue smoke. The Cavalier uses the same 2.4L and 2.2L engines. -- http://www.gaownersclub.com/forum/showthread.php?t=155659

3 of 3 people found this helpful.
Best Answer
1,065

lol racecar cavalier.

2 of 2 people found this helpful.
135

I read the thread you linked me to. I do have a catch can but have not checked it yet. If it is full would it cause my problem? Im gonna check it out when I go to the shop to work on the car. I still have not checked the map sensor either.

1 of 1 people found this helpful.
135

and yes it is a racecar. got us 5 wins last season.

1 of 1 people found this helpful.
135

I began by checking the catch can but that was not the issue. I have since replaced the map sensor with no results as well. We then began to look for a vaccum leak but found nothing. we used the method where you spray brake clean all over the motor but nothing happened. We then checked the coil pack but found nothing wrong with it as well. We have checked all sensors on the vehicle and nothing has had an affect. We then began messing with the fuel system. If we reduced the fuel pressure from 45 to roughly 25 the car would run fine. I know the car requires 41-47 psi of fuel pressure. We checked the fuel injectors and everything was just fine. I have a complete engine harness but dont know if replacing it or the controller would have any affect. I would love some advice.

2 of 2 people found this helpful.

Your Answer

Add photo

Related Questions

Cavalier

Looking for a Used Cavalier in your area?

CarGurus has 1,000 nationwide Cavalier listings and the tools to find you a great deal.

ZIP:

Search Chevrolet Cavalier Questions

Chevrolet Cavalier Experts

#1 John Saffrahn
John Saffrahn
Reputation 2,920
#2 dandyoun
dandyoun
Reputation 1,300
#3 mbar1
mbar1
Reputation 1,180
View All

Related Models For Sale

Used Chevrolet Malibu
948 Great Deals out of 79,665 listings starting at $1,500
Used Honda Civic
656 Great Deals out of 88,604 listings starting at $995
Used Chevrolet Camaro
226 Great Deals out of 30,943 listings starting at $1,217
Used Chevrolet Impala
521 Great Deals out of 31,726 listings starting at $1,450
Used Ford Mustang
474 Great Deals out of 45,735 listings starting at $1,999
Used Pontiac Sunfire
310 listings starting at $3,975
Used Toyota Corolla
783 Great Deals out of 73,832 listings starting at $1,995
Used Chevrolet Corvette
120 Great Deals out of 20,753 listings starting at $3,000
Used Ford Focus
543 Great Deals out of 57,172 listings starting at $1,095
Used Honda Accord
813 Great Deals out of 84,286 listings starting at $1,050
Used Ford Taurus
250 Great Deals out of 20,434 listings starting at $699
Used Pontiac Grand Prix
30 Great Deals out of 2,871 listings starting at $900

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.