Thread: having trouble with tbi

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ive put and 86 or older 350 into a 88 gmc with tbi
the truck has a really hard time starting and when it does you have to keep foot on the gas. what can cause this or should i go to a 4bbr and do away with the computer controls to the motor?

Originally posted by chris88gmc
ive put and 86 or older 350 into a 88 gmc with tbi
the truck has a really hard time starting and when it does you have to keep foot on the gas. what can cause this or should i go to a 4bbr and do away with the computer controls to the motor?

did you transfer all of the sensers? do you have any codes?

I'm having the same problem with my '90 Chevy 1/2 ton (350 TBI), hard starting, dies when I take my foot off the gas. I've replaced every sensor on the truck, and still have the problem. I think that I have a bad fuel pump, but I haven't replaced it yet. You might check to see if your engine dies when the fuel level is really low and you make a sharp turn or stop fast. Both situations will move fuel away from the pump pickup for a few seconds. I've noticed that my truck always dies when I do this, and is really hard to get restarted. These symptoms just confirm my feelings that I have a bad pump. I'm not going to replace it until it warms up a little outside though, it's too stinkin' cold to be pulling a gas tank. If my new pump cures my problems I'll send you an e-mail and let you know (assuming you're still having problems).

You should check your computer codes, and see what you get from that, although I don't think a fuel pump will show up as a trouble code. I didnt check for codes on mine, and it probably could have saved me the time and expense of replacing sensors. Overall, I think TBI is a pretty good setup, and you should probably stick with it and try to make it work properly. I wish I could give you a definitive answer, but I don't know myself... yet!

Randy