Hiccup in engine

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Dec 24, 2004 | 09:55 AM

Dave462

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From: SoCal

Hiccup in engine

OK, got another problem with my 88 Bronco II, 2.9. Driving down the road at 55-60, every couple of miles(sometimes more often) the engine cuts out for literally the blink of an eye and then it's back to normal. I've run the codes and get a system pass. I changed both fuel filters. Fuel pressure is 36 psi and when I start it it drops the 3-10 psi like it's supposed to. Checked vacuum hoses and they are OK, no leaks. After I had the oil changed, it died on me at a stoplight, but it started right up. It started to cut out more often then but after 15 minutes driving it went back the every couple of miles. Any ideas?

Dave

Dec 24, 2004 | 10:44 AM

plilikoi

Mountain Pass

Joined: Sep 2003

Posts: 215

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From: San Diego

Quote:

Originally Posted by Dave462

I'd suspect an electrical problem, probably an intermittent open circuit in some critical line upstream of the injectors and, perhaps, upstream of the coil.

Good luck and Happy Christmas.

Dec 24, 2004 | 11:03 AM

V8muscle

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From: Marietta, GA

Most likely the module on the distributor. Very common failure. IIRC they are fairly cheap at your local Autozone, Advance, whatever and fairly easy to replace.

Bill

Dec 24, 2004 | 07:03 PM

Ken00

Post Fiend

Joined: Dec 2001

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From: South Jersey

Your KOER fuel pressure is way to low, should be 28-38psi.

Dec 25, 2004 | 09:21 AM

Dave462

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From: SoCal

Quote:

Originally Posted by Ken00

Your KOER fuel pressure is way to low, should be 28-38psi.

Ken, sorry I did not make it clear. The 3-10 psi was the drop in pressure stated in the manual after starting the engine. The fuel pressure before starting was 36 psi. After starting it was around 32-34psi. Sorry for the confusion.

Thanks for the responses. I'll look into the module after the weekend.

Merry Christmas

Dave

Jan 7, 2005 | 12:53 PM

Dave462

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From: SoCal

Well, still no go. Replaced the module and the pickup coil and the problem persists. It's been at a shop for a day and a half and they can't find anything wrong. When the engine dies it starts right up again and no codes are present. I'm thinking of replacing the "brain box". I'll go over the wiring and look for breaks that could cause an intermittent failure, but other than that I'm stumped.