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cranks but will not start sometime corolla 2008
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yaser
New User
Dec 30, 2019, 6:40 PM
Post #1 of 2
(788 views)
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cranks but will not start sometime corolla 2008
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Hi, have a 2008 corolla with 188K, I bought the car 4 months ago, and since 2 months that cars (beginning of winter) the car will not start some time (it will crank but not start), sometimes it starts after 2 or 3 attempt, sometime it takes much longer (in one occasion the batter died while trying to start the car).
There is no check engine light and no computer scan code.
I replaced the fuel pump with one bought from ebay.
One mechanic told me its a computer problem, there is no communication between the engine and the fuel system
I am not sure, as I don't want to replace the computer (too costly) for nothing.
Is it possible to replace the computer at shops other than the dealership (i.e, do I need to reprogram the computer if I change it) or will it work fine. if so I should be able to replace the computer at reasonable cost
appreciate any help
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 30, 2019, 6:43 PM
Post #2 of 2
(781 views)
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Re: cranks but will not start sometime corolla 2008
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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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