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91 camaro rs wont stay running
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tylerwatkins
Novice
Oct 19, 2011, 11:00 AM
Post #1 of 11
(4785 views)
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91 camaro rs wont stay running
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I have replaced the fuel pump (that was fun!) and now car cranks but wont stay running, what should i do next, fuel injectors, OPSU?
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 19, 2011, 1:29 PM
Post #2 of 11
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Re: 91 camaro rs wont stay running
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I'd suggest diagnosing it properly and not throw any more parts at it.
All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.
Every engine requires spark, fuel and compression to run. That's what we have to look for.
These are the basics that need to be tested and will give us the info required to isolate a cause.
1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.
2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.
3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.
4) If all of these things check good, then you would need to do a complete compression test.
Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
/ Moderator
Oct 19, 2011, 5:14 PM
Post #3 of 11
(4750 views)
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Re: 91 camaro rs wont stay running
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What is an OPSU?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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tylerwatkins
Novice
Oct 19, 2011, 9:23 PM
Post #4 of 11
(4735 views)
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Re: 91 camaro rs wont stay running
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OPSU Oil Pressure Sending Unit
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 20, 2011, 3:15 AM
Post #5 of 11
(4729 views)
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Re: 91 camaro rs wont stay running
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Yeah, we knew that..............
I install one whenever I don't know what the problem is.... yeah, and if that doesn't work I change all the fuel injectors. If that doesn't work I plug the neighbor kids Nintendo into it.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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tylerwatkins
Novice
Oct 20, 2011, 5:08 AM
Post #6 of 11
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Re: 91 camaro rs wont stay running
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LMAO!! I guess I should be nicer to my neighbors kids!! I may be needing them!
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re-tired
Veteran
/ Moderator
Oct 20, 2011, 8:58 AM
Post #7 of 11
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Re: 91 camaro rs wont stay running
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Tyler , its great that you have a sense of humor . On a more serious note . We want you to fix your car . Follow HT's troubleshooting guide no matter how redundant it seems . You will fix your car without buying a lot of unneeded parts.
LIFE'S SHORT GO FISH
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tylerwatkins
Novice
Oct 20, 2011, 12:53 PM
Post #8 of 11
(4695 views)
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Re: 91 camaro rs wont stay running
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 yea, i'm gonna go down the list suggested by hammertime, hopefully i don't have to do more than the first two!! that would be awesome..it was my dad's car & he passed away, unfortunately he ran it dry a couple times when he was sick, and i think that is where the pump issue came into play.. it has been sitting for 5 yrs in garage..Brand spanking new "looking" all the way down to exhaust! Now just to get her running! I like the fishing line on your post.. cool My dad was a huge fisherman alot of the men in my family are commercial fisherman!! Thanks for your input on car!
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 20, 2011, 2:00 PM
Post #9 of 11
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Re: 91 camaro rs wont stay running
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No, you have to do every test. Just because it may fail one test doesn't mean it won't fail more than one and that tells us something.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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tylerwatkins
Novice
Oct 22, 2011, 4:36 PM
Post #10 of 11
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Re: 91 camaro rs wont stay running
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 Well I have gr8 news:0!!! I realized i hadn't changed fuel filter. So to day i did OMG it was "gunked up" As soon as i dropped the car down I tried to start it and bingo!! Running like a champ! I feel really stupid but i have been working 2 jobs and guess i was tired, but anyway thank you for all your input i really appreciate it
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 22, 2011, 4:40 PM
Post #11 of 11
(4664 views)
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Re: 91 camaro rs wont stay running
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Yep, taking a fuel pressure reading as suggested in the first post would have exposed that a long time ago.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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