Question about 1988 Chevrolet Camaro

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1988 iroc-z 350 tpi - runs poorly when hot (190-200degrees)

If car has been tuned-up, new high performance radiator , new 52mm tpi throttle body , mass flow sensor working , k&n air filter good , but car still runs poor when at max temp - Is there problems with early chevy injectors
or something else I can do other than spend big dollars for new injectors?

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  • crazytaz0568 Jul 12, 2008

    1988 chevy camaro Z-28 with a crate motor, with big cam is about all I know about this car, I just bought it and it has been in and out of the mechanics garage for the last month 1/2, they cannot even figure it out. It originally was coming up as a mass airflow sensor, I forgot the code number it was thirty something. ( the problem is: when you drive it for about a block, the engine light will come on and it will start running eratic and real rough and when you come to a stop in these conditions, it will want to stall, so you have to keep the RPM's up. When turn it off for about 10 to 20 seconds and start it up again, the engine light will be off and the car would be running normal and powerful the rest of the day,it's just real intermittent, does it when it wants too. Anyway I changed the Mass Airflow Sensor and the burn off relay, now when the car acts that way, it is throwing a code 33. Took out the superchip, put in a new stock chip back in it. I seems to be doing better, but still not good. It has me and the mechanics stumped, could it be my ECM??

  • Joe Morehead Jan 25, 2009

    how many pounds of fuel pressure should a new fuel pump have? Is there only one fuel filter and can you tell me where it is located on the car. I am having rough idle, poor acceleration, only runs better at about 1000 rpm and can not accelerate smoothly up from there. Very erratice idle. Please help me!

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  • 121 Answers

Does it run poor at full throttle or between quarter and half throttle? Does it hessitate? If it does the EGR valve may be worn out. I had an 87 transam with TPI and was having problems with it stumbling and hesitating when it was warmed up. If the car starts hard and you have these problems then the issue may be low fuel pressure. Hook a guage up to the fuel rail and make sure you are getting pressure. If you are only getting a few pounds of pressure it may be the fuel pump or fuel pressure regulator. Good luck and if you thought this information was helpful please rate it when you get a chance.

Thanks - Tech101

Posted on Jun 26, 2008

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This is only a suggestion but I had a similar problem. I have a 1987 Camaro Iroc z fuel injected. I had a similar problem with the car back firing through the throttle body. It turns out it was the TPI sensor mounted on the front of the throttle body. The sensor is mounted on the front of the throttle body to the left on my car, the opposite side of the linkage. Its black in color and has a electrical connection to the back side of it. Its triangular in shape and mounted with to hex head screws if this is of any help to you locating it. Try adjusting it first that may correct your backfiring problem like it did for me. If this was any help to you leave me some feed back.

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