1993 Chevrolet Lumina intermittent start but shuts down

MUCHAELB

MEMBER
1993 CHEVROLET LUMINA
3.1L
V6
FWD
AUTOMATIC
155,000 MILES

Ck injector pulse dim when it doesn't start bright when it start but shuts down when giving gas leaning towards ECM

Monday, June 22nd, 2015 AT 2:49 PM

10 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,256 POSTS

Hi MuchaelB,

I would disconnect the TPS and all oxygen sensors, re-test, if it still does it, crankshaft angle sensors are common on that engine, and let me know.

Best, Ken

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Monday, June 22nd, 2015 AT 9:25 PM

MUCHAELB

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6 POSTS

I have disconnected all sensors but it seems as if it's a short with injector noid light connected light vary dim but I will ck crank sensor today. I can tell when car is going to start light gets bright but when I hit throttle it dies out.

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Tuesday, June 23rd, 2015 AT 4:24 AM

KEN L

MASTER CERTIFIED MECHANIC
47,256 POSTS

Hi MuchaelB,

I was thinking too, it could be a shorted injector causing the the problem, you can use this guide to test them:

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Let me know what you find

Best, Ken

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Tuesday, June 23rd, 2015 AT 10:14 AM

MUCHAELB

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6 POSTS

Ok but all the injectors are not assessable.

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Tuesday, June 23rd, 2015 AT 10:42 AM

MUCHAELB

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6 POSTS

Help

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Tuesday, June 23rd, 2015 AT 12:00 PM

KEN L

MASTER CERTIFIED MECHANIC
47,256 POSTS

Hi MuchaelB,

Can you try unplugging them one at a time and rechecking? Maybe we will get lucky ;-)

Best, Ken

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Tuesday, June 23rd, 2015 AT 6:33 PM

MUCHAELB

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6 POSTS

Pulled the intake several times check all the injectors one at a time still same results.

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Wednesday, June 24th, 2015 AT 3:48 AM

KEN L

MASTER CERTIFIED MECHANIC
47,256 POSTS

Hi MuchaelB,

I forgot to ask, did you get a chance to change out the crankshaft angle sensor?

here is link that will get you started,

https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

Let me know how it goes

Best, Ken

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Wednesday, June 24th, 2015 AT 9:35 AM

MUCHAELB

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6 POSTS

Yes I change the crank sensor ck resistance on all injectors Right bank readings are 00.7 12.1 and 12.1. Left bank readings are 12.3 00.7 and 08.9 the 3.1 (Vin T) 0hms should be 12.0-12.4 so I'll change out the injectors that are not up to specs.

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Wednesday, June 24th, 2015 AT 10:21 AM

KEN L