Intermitant failur: Engine cranks, will not run.

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Oct 27, 2010 | 10:08 PM

joes24

Thread Starter

7th Gear

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Intermitant failur: Engine cranks, will not run.

1992 LT1 series P with 140,000 miles. I installed new fuel pump but problem remains. Should I replace pump relays, or have ECM remanufactured? Any suggestions appreciated. Joe Mayer

Oct 27, 2010 | 11:24 PM

Lemme

Drifting

Joined: Nov 2009

Posts: 1,341

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From: Perth Western Australia

St. Jude Donor '10

Quote:

Originally Posted by joes24

1992 LT1 series P with 140,000 miles. I installed new fuel pump but problem remains. Should I replace pump relays, or have ECM remanufactured? Any suggestions appreciated. Joe Mayer

Do you have spark? What is your fuel pressure before and during cranking?

Oct 28, 2010 | 04:21 AM

rodj

Le Mans Master

Joined: Aug 2000

Posts: 8,838

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From: Australia

Quote:

Originally Posted by joes24

will not run.

Will not fire up ( start ) or will not stay running?

Early LT1 , might be looking at a new Opti spark ( distributor ) if original

Oct 28, 2010 | 01:40 PM

joes24

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7th Gear

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When the failure occurs and I try to start, the engine frequently fires once and dies. I have insatalled a complete new ignition system within a year. Battery, coil, distributer, plugs and wiring. When the engine starts normally, it roars into life on first crank. I have to assume plenty of spark is available. A brand new fuel pump last week didn't make any difference so I assume fuel pressujre is not the problem however I don't have the ability to test the pressure. The factory manual indicates intermittant failures are most likely due to electrical connections, or defective relays. Joe

Oct 28, 2010 | 01:43 PM

joes24

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7th Gear

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Thanks for responding. I have replaced the distributor twice; most recently in 2008. It seems to be working fine right now. Joe

Oct 30, 2010 | 06:02 AM

Lemme

Drifting

Joined: Nov 2009

Posts: 1,341

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From: Perth Western Australia

St. Jude Donor '10

Quote:

Originally Posted by joes24

Testing the fuel pressure and spark by buying a gauge ($50) and a meter ($20) is much cheaper than changing parts hoping it might fix the issue.

Dec 31, 2010 | 03:06 PM

richauto

Instructor

Joined: Aug 2010

Posts: 200

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From: Somers N.Y.

Quote:

Originally Posted by joes24

1992 LT1 series P with 140,000 miles. I installed new fuel pump but problem remains. Should I replace pump relays, or have ECM remanufactured? Any suggestions appreciated. Joe Mayer

Joe, you never said that you changed the fuel filter. You may have overlooked that.