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Intermittent car starting problem...HELP!!!?
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psychomotif
New User
Sep 28, 2009, 8:07 AM
Post #1 of 2
(1184 views)
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Intermittent car starting problem...HELP!!!?
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Intermittent car starting problem...HELP!!!?
My
car will turn on perfectly every morning, but if i drive for about 10
miles and park it on an uneven ground for about 40 to 60mins it will
not start.
However if i let it sit on that same uneven ground for about 1.5 or 2 hrs i will start back right away.
Someone told me it could be the Fuel Pump Relay, so i switched the Air
conditioner Relay with the Fuel pump relay and it seemed to have solved
the problem.
link deleted...not allowed
I tested the car in every condition, timed it, put it on inclines and
it was good , but after a week the starting problem started again when i park
on uneven ground after a drive and restart after an 1hr.
Is the Fuel pump relay going bad every time? what could be the cause?
Additional Details
It is a 2000 Mercury Cougar V6 with 124,000miles a cold air intake system and a cat-back duel exhaust. I am in United States(Pennsylvania)
Additional Details
spark
plugs have been changed, fuel filter, ignition wires, fuel pump. Could not be the
fuel pump because the car runs strong after starting as if nothing ever
happened.
(This post was edited by Hammer Time on Sep 28, 2009, 9:41 AM)
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 28, 2009, 9:42 AM
Post #2 of 2
(1176 views)
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Re: Intermittent car starting problem...HELP!!!?
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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.
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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