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ENGINE QUIT ON WAY HOME FROM WORK
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tpthrshr
New User
May 8, 2012, 6:57 PM
Post #1 of 3
(1583 views)
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ENGINE QUIT ON WAY HOME FROM WORK
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Year of vehicle 1989
Make of vehicle Cadillac
Model of vehicle Sedan de Ville
Engine size 4.5 V8
Mileage/Kilometers 218,426
Driving home from work, came down hill to a stop light, engine quit when I braked and now won't start. I can hear it trying to turn over, so don't think it's a starter issue. Haven't noticed a rough idle. Checked gas, oil and water-all OK. Yes, we do regular maintenance.
Any ideas?
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Hammer Time
Ultimate Carjunky
/ Moderator
May 8, 2012, 7:21 PM
Post #2 of 3
(1552 views)
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Re: ENGINE QUIT ON WAY HOME FROM WORK
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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
May 8, 2012, 7:37 PM
Post #3 of 3
(1536 views)
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Re: ENGINE QUIT ON WAY HOME FROM WORK
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Fuel pressure is 9-12 psi. You should be able to remove the air duct and check to see if the injectors are spraying fuel when you crank the engine too.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on May 8, 2012, 7:38 PM)
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