Northstar Engines and System Technical Discussion Discussion, Check engine light won't go away??? in Cadillac Engine Discussion; Hey guys......failed inspection due to cat converter. Replaced with an aftermarket converter and also changed the spark plugs. The only ...
Hey guys......failed inspection due to cat converter. Replaced with an aftermarket converter and also changed the spark plugs. The only 2 codes showing are for the converter which is replaced an old code for crankshaft sensors which i did a year ago? Why wont the engine light go off? I cleared all codes on dash... Also when i come to a stop theres like a shaking going on like a gas flutter... I need help guys thanks alot
Automobile(s): 2002.5 F55 STS, 2014 Explorer XLT 4WD
MD Eastern Shore
Re: Check engine light won't go away???
A steady SES light is usually an intermittent miss - spark or fuel related. A flashing SES is severe misfiring.
2000 Deville - divorced MAF - is all the intake air ducting properly hooked up and securely clamped ?? ANY air leak at or after the MAF will cause a nasty idle and may cause an intermittent misfire, which turns on the SES light.
Did you clean out all the plug boots, check the inner connector springs and use a tad of dielectric spark plug boot grease in the tip of each one ?
Cadillacs do not like aftermarket converters. Don't ask me why; it's black magic.
The CKP job - Have you checked the two electrical connectors for CKP's A & B ?
........ and, as vincentm posted, AC Delco #41-987 Platinum plugs only.