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  #1  
Old 01-13-2005, 04:21 PM
rockwild rockwild is offline
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Ecm Test
how do i test the ECM the fuel pump is not working and the injector is not injecting
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Old 01-13-2005, 04:49 PM
Fractured1 Fractured1 is offline
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1st have you checked all the fuses and relays...
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Old 01-13-2005, 04:55 PM
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Re: Ecm Test
yes i have replaced all!!
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Old 01-14-2005, 02:21 AM
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BlazerLT BlazerLT is offline
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Re: Ecm Test
Please supply information.

Year, engine, model
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Old 01-14-2005, 09:14 AM
rockwild rockwild is offline
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Re: Ecm Test
it is an 84 I started with 1.9 and changed it over to a 4.3 tbi it work great. Then I slung a rod so I am now putting a 4.3 cpi any help would be great thanks!!!
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Old 01-14-2005, 09:19 AM
rockwild rockwild is offline
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Re: Ecm Test
tbi came out of a 92 blazer cpi came out of a 94 blazer. I had the whole truck so wires were not a problem
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Old 01-14-2005, 12:05 PM
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Re: Ecm Test
well, you will need a new fuel pump and the complete wiring harness from the 1994 for this truck to fire up.

you cannot use a TBI pump on a CPI engine.

You need to get a CPI pump.
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