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

98,075

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
1,075

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 1,014 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 2,930
#2 dandyoun
dandyoun
Reputation 1,330
#3 mbar1
mbar1
Reputation 1,180
View All

Related Models For Sale

Used Chevrolet Malibu
1,062 Great Deals out of 77,909 listings starting at $1,500
Used Honda Civic
811 Great Deals out of 88,099 listings starting at $1,299
Used Ford Focus
633 Great Deals out of 57,258 listings starting at $795
Used Chevrolet Impala
591 Great Deals out of 34,068 listings starting at $899
Used Chevrolet Camaro
242 Great Deals out of 31,193 listings starting at $369
Used Honda Accord
946 Great Deals out of 77,735 listings starting at $899
Used Ford Mustang
543 Great Deals out of 45,845 listings starting at $1,999
Used Toyota Corolla
860 Great Deals out of 70,584 listings starting at $1,874
Used Ford Taurus
270 Great Deals out of 20,573 listings starting at $1,995
Used Toyota Camry
1,104 Great Deals out of 90,757 listings starting at $1,599
Used Pontiac Sunfire
323 listings starting at $2,100
Used Nissan Altima
1,156 Great Deals out of 79,666 listings starting at $500
Used Chevrolet S-10
5 Great Deals out of 1,311 listings starting at $2,400

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.