98 Northstar, cranks/backfires/no start
150

Asked by 98DevilleWi Feb 14, 2017 at 08:23 PM about the 1998 Cadillac DeVille Sedan FWD

Question type: Maintenance & Repair

98 Deville, Northstar. Just died one day. Cranked,
but no start, with backfires and random hits and
misses. Discovered ICM was cracked and failed.
Replaced the ICM, loaded the fuel system, fired up
and ran for about 4 seconds, died. Tried to start
again, more hits and misses and backfires. Fuel
pressure is good (52 lbs), and I'm getting spark.
Weird thing is, it ran like a top for about 4 seconds,
then died. Reseated and cleaned the intake flap
behind the ps pump, all good there. Is there a learn
for the replaced ICM? What could cause this? Ran
perfect for 4- 5 seconds. Thanks guys and gals!

2 Answers
150

98DevilleWi answered 7 years ago

Thanks, Jim! I'll get my hands on a compression tester and check it out.

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150

98DevilleWi answered 7 years ago

The thing that gets me, is that it ran great for 4 - 5 seconds before it died. Checked on the forums, and it's extremely unlikely it's timing. It's an interference engine, so there would be all kinds of racket from valves hitting pistons. Going to check cylinder pressure next.

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