1995 Chevy Blazer Wont Start

RASMMS4140

MEMBER
1995 CHEVROLET BLAZER
6 CYL
4WD
AUTOMATIC
183,000 MILES

95 s-10 Blazer OBDII 4.3L CMFI cranks but wont start. New Battery, new starter, reman engine less than 2000 Mi, Reman trans. Fuel press 60 at rail hold steady after key off. Spark at coil secondary, spark at plugs. Fuel injector resistance 1.7 omhs. It was running fine then just shut off. No blown fuses. What gives?

5 Replies

JDL

MECHANIC
16,098 POSTS

Welcome to the forum, check for injector pulse, engine cranking. I just wanted to add, if the computer doesn't see an rpm signal, it won't pulse the injector. With engine cranking, the purple wire with white tracer carries the rpm signal from ignition module to computer. Engine cranking, there should be a pulse on that wire?

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Thursday, November 26th, 2009 AT 3:15 PM

RASMMS4140

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2 POSTS

What do I use to check the pulses with, what is the pulse voltage.

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Thursday, November 26th, 2009 AT 3:28 PM

JDL

MECHANIC
16,098 POSTS

Use a noid lite, the autostore sells them. I have used a dmm that had a tach setting-- duty cycle-- dwell, any of those will react to a dc pulse. If you just try to look at voltage, the dmm may average it. You won't see a pulse.

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Friday, November 27th, 2009 AT 8:28 AM

RASMMS4140

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2 POSTS

Noid light shows pulses to injector. Found no resistance on crank sensor. Replaced it still no start. Check compression 120 psi. I am baffled please help.

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Saturday, November 28th, 2009 AT 7:46 PM

JDL