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#1
11-22-2009, 05:33 PM
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1994 4.3 vortec cps location
My 1994 4.3 vortec in a blazer is dying at idle. Mechanic said the cps is bad but don't know where to find it.
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#2
11-23-2009, 10:23 AM
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Re: 1994 4.3 vortec cps location
Quote:
But proper testing first before throwing parts at it. What did the mechanic say was bad on it?. What is it doing or not doing? Does it have proper fuel pressure?
__________________
Remember proper testing gives us the answer to many problems. MT
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#3
11-23-2009, 12:14 PM
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Re: 1994 4.3 vortec cps location
It dies at a stop or low idle. It is hard to start back up usually. When it is running it runs good. Good fuel pressure. Mechanic said it showed on his computer it lost signal with the crank.
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#4
11-23-2009, 01:44 PM
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Re: 1994 4.3 vortec cps location
Quote:
What was the code no and what was the fuel pressure reading?
__________________
Remember proper testing gives us the answer to many problems. MT
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#5
11-23-2009, 04:09 PM
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Re: 1994 4.3 vortec cps location
Are you saying this motor does not have a crank position sensor? On the fuel pressure I think it was 65lbs but not sure. I got a cps at O'Riellys and they told me it was on the front of the motor below the timing cover but its not there.
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#6
11-23-2009, 04:37 PM
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Re: 1994 4.3 vortec cps location
Quote:
S-10 Blazer no. THEY DO NOT HAVE ONE. Big Blazer code yes. What engine code and what Blazer? What was your code no?
__________________
Remember proper testing gives us the answer to many problems. MT
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#7
11-23-2009, 06:04 PM
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Re: 1994 4.3 vortec cps location
Sorry it is a S-10 Blazer.
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#8
11-23-2009, 06:05 PM
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Re: 1994 4.3 vortec cps location
Sorry it is a S-10 Blazer.
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#9
11-23-2009, 06:31 PM
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Re: 1994 4.3 vortec cps location
Quote:
Does it have the new style flat top dist or code w engine? What code no did he get on scanner?
__________________
Remember proper testing gives us the answer to many problems. MT
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#10
11-23-2009, 07:24 PM
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Re: 1994 4.3 vortec cps location
The '94 does not have a crank sensor and has the reguler HEI system, the top mounted spark plug wire cap. What does it do when it stops running? Does it stumble or just cut out? Are you/your mechanic sure you are not reffering to the CPI (central port injector)?
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#11
11-23-2009, 07:58 PM
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Re: 1994 4.3 vortec cps location
Yes it has the top mount spark plugs. It is a "W" motor.When it dies it just quits no stumble. I replaced the injector controller under the intake. It did run good for a while, no dying, but started back the same way in a couple days. I'm not sure what code it showed or what the mechanic saw from his computer.
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#12
11-23-2009, 08:46 PM
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Re: 1994 4.3 vortec cps location
This could still be a related ignition issue. The ignition control module is located under the cap and can exhibit problems like you mention. These sytems are pretty straight forward, but of course, you have to properly diagnose. When the truck dies out, pull a plug wire off and check for spark, if your getting nothing or a random spark, your ignition module most likely needs to be replaced.
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#13
11-23-2009, 08:51 PM
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Re: 1994 4.3 vortec cps location
Thanks for all the help. I will do some checking and I hope you are right. I wonder now what the sensor O'Riellys gave me is for? It can go back so itdoesn't matter..
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#14
11-24-2009, 10:12 AM
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Re: 1994 4.3 vortec cps location
As said the big Blazer has that crank sensor.
Test it when it quits as blazes9395 said. If good spark then give it a shot of carb cleaner and see if it will fir up. If so you have a fuel delivery problem. If you are losing fuel delivery and have good injector pulse check the injector wiring that runs into intake. I have saw a lot of them with broken wires and bad plugins. Look at and check the plugin where it plugs onto injector unit real close.
__________________
Remember proper testing gives us the answer to many problems. MT
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#15
03-03-2010, 05:32 PM
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Re: 1994 4.3 vortec cps location
I have good spark but it does not have good injector pulse. How much fuel pressure is it suppose to have?
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