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1987 Corvette L98 turns over fires but wonít start

 
Old 07-09-2019, 07:10 AM
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JaredAwells
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Default 1987 Corvette L98 turns over fires but wonít start

I have a 1987 z-51 corvette with a stock L98 and sometimes it will start and run just fine sometimes it will turn over fire and then die I am out of ideas on what it could be causing it I plan on driving it to college next month and Iíd like for it to be more reliable I have replaced the following, MAF, TPS IAC fuel pump fuel filter oil pressure switch Iíve disabled the VATS it has all new plugs and wires Iím tired of spending money on parts that donít fix my problem my next route would be either new injectors or Ecu any advice would be much appreciated

Last edited by JaredAwells; 07-09-2019 at 07:24 AM. Reason: Missing information
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Old 07-09-2019, 07:35 AM
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Joe C
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start with the basics - FUEL, spark , timing. have you run a fuel pressure test? do you have a FSM? BTW, quit throwing parts at the problem.
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Old 07-09-2019, 07:41 AM
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cadmaniac
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When it won't start, check your fuel pressure at the rail. Could be a Fuel pressure regulator.

Sounds like a Fuel Problem. When it wont start, spray some starting fluid in the throttle body to confirm. If it starts, it's probably not a timing or ignition related problem. Diagnose, don't guess.
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Old 07-09-2019, 08:36 AM
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Sounds like fuel-issues. Check fuel pressure at rail first, with ignition in run but not started, then see how it behaves when you try to fire it.
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Old 07-09-2019, 08:40 AM
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Originally Posted by Joe C View Post
start with the basics - FUEL, spark , timing. have you run a fuel pressure test? do you have a FSM? BTW, quit throwing parts at the problem.
Yes I have checked the fuel pressure in the run position it made between 40-42 psi I havenít tried it when turning it over
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Old 07-09-2019, 08:42 AM
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Originally Posted by cadmaniac View Post
When it won't start, check your fuel pressure at the rail. Could be a Fuel pressure regulator.

Sounds like a Fuel Problem. When it wont start, spray some starting fluid in the throttle body to confirm. If it starts, it's probably not a timing or ignition related problem. Diagnose, don't guess.
I have a fuel pressure regulator on the way off run a pressure test as soon as I get home to make sure itís what I need
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Old 07-09-2019, 08:44 AM
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When it does start, does it run correctly, or sound lean or rich? Another words, is is it flooded or starving for fuel when it runs?
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Old 07-09-2019, 11:49 AM
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Originally Posted by cadmaniac View Post
When it does start, does it run correctly, or sound lean or rich? Another words, is is it flooded or starving for fuel when it runs?
When it does run it runs smoothly but it does smell a little rich
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Old 07-09-2019, 12:29 PM
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Hook up pressure gauge at rail, observe pressure when running. Turn off car or let it turn off by itself, watch FP gauge reading. Should hold.

Then best to hook up a scanner and datalog it to see what the computer is seeing before replacing any further parts.
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Old 07-09-2019, 03:23 PM
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Originally Posted by vader86 View Post
Hook up pressure gauge at rail, observe pressure when running. Turn off car or let it turn off by itself, watch FP gauge reading. Should hold.

Then best to hook up a scanner and datalog it to see what the computer is seeing before replacing any further parts.
Do parts stores scan OBD1 anymore?
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Old 07-09-2019, 06:04 PM
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Parts stores scan codes, what you want to do is buy a scanner that will read OBD1. Mine is an Actron from Autozone with an adapter to let it read OBD1.

You can also buy an OBD1 cable and use DataMaster on your laptop.
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Old 07-09-2019, 06:36 PM
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Originally Posted by vader86 View Post
Parts stores scan codes, what you want to do is buy a scanner that will read OBD1. Mine is an Actron from Autozone with an adapter to let it read OBD1.

You can also buy an OBD1 cable and use DataMaster on your laptop.
Okay Iíll pick one up is there a link to download data master? Or is it just a website?
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Old 07-10-2019, 10:07 PM
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Put a paperclip in the top right 2 ports of the diagnostics connector and you can read the codes for free. Same codes as a tester.

Last edited by xrav22; 07-10-2019 at 10:08 PM.
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Old 07-11-2019, 08:07 AM
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Originally Posted by xrav22 View Post
Put a paperclip in the top right 2 ports of the diagnostics connector and you can read the codes for free. Same codes as a tester.
He does not need to scan codes here, he needs to look at the datastream.
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Old 07-11-2019, 04:32 PM
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Originally Posted by vader86 View Post
He does not need to scan codes here, he needs to look at the datastream.
Yes I myself do not have a laptop to get the data however in the next week or two I will use my cousins to find what is wrong
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Old 07-12-2019, 12:41 PM
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kael
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Just to make sure, no codes? As in Service Engine light is off? Since you replaced the MAF, I'd be surprised no codes unless you spent $600+ for the Bosche.
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Old 07-13-2019, 03:21 AM
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Originally Posted by kael View Post
Just to make sure, no codes? As in Service Engine light is off? Since you replaced the MAF, I'd be surprised no codes unless you spent $600+ for the Bosche.
I have a Bosch in there yes but it does have a check engine light on but it goes off and on
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Old 07-13-2019, 10:44 AM
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Then what is the code set?
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Old 07-13-2019, 12:35 PM
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Originally Posted by vader86 View Post
Then what is the code set?
I canít recall the number but itís just a O2 sensor fault
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Old 07-14-2019, 09:24 AM
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If your O2 sensor is dead or dying it can flood the engine and make it cut off.

Replace the sensor and check its wiring, that should've been the first thing you did.
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