Question about 1989 Chevrolet G20

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My '89 Chevy G20 350ci (5.7l) TBI Has a hard starting problem in the morning . Ive heard a MAF sensor can cause this or is it fuel related ? Thanks .

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  • Robert Wood
    Robert Wood Jun 13, 2015

    Try some injection cleaner in case the injectors are clogging up and leaning out too much.



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Could be a weak fuel pump and as Russell said the temp sensor may be letting it run too lean or too rich causing trouble starting.

Posted on Jun 13, 2015

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MAF sensors can cause the engine to run rough, have no power, etc. I had a Blazer that didn't run right on start up. It would backfire and run rough until it warmed up, but still never ran good. MAF stands for mass air flow and if it tells the computer the wrong airflow, the computer will mis-judge the amount of fuel to add. On the other hand, if it won't start at all it could be the fuel!

Posted on Apr 01, 2015

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For 14 to 25 dollars may i suggest a coolant temp sensor

Posted on Apr 01, 2015

  • Craig Hoskins Jun 13, 2015

    Replaced that about a year ago due to cracked terminal .


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Posted on Jan 02, 2017

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SOURCE: engine hard to start

we have the same is your fuel regulator.

Posted on Nov 16, 2008

  • 14036 Answers

SOURCE: 92 chevy tbi 350 surge problem tried all

surge problems cause by fuel pump and transmission torque converter.

Posted on Jun 09, 2009

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SOURCE: 92 chevy 1500 5.7 tbi starts and dies. replaced

Try using a good fuel line/injector cleaner Seafoam is a good one. If this does not help you may have tone or more clogged injectors. Clean these out and you should be good to go. tTo see Seafoam in action goto you tube type Seafoam into the search box.

Posted on Jul 08, 2009

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SOURCE: 1987 chevy s10 2.5l tbi will not start. changed

That eliminates the crankshaft and camshaft position sensors. Have you checked the fuel injector itself for an open winding or stuck valve plunger? There should not be a steady 12 volts to the injector--if good injector, it would be spraying fuel steadily into the throttle body. But at least the engine should try to run if poorly. Take the injector out, dry it off with air, and intermittently apply 12 volts to one terminal while grounding the other. You should hear a click from inside every time you touch 12 volts. If not, replace it. If it does, it may be plugged with debris. Try blowing through it in reverse with compressed air.

Posted on Jul 17, 2009

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SOURCE: Where is the fuel regulator located on a 1988 tbi

No, low fuel pressure is caused by a weak fuel pump.
High fuel pressure is caused by a faulty fuel regulator.

Posted on Nov 14, 2009

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