Question about 1998 Pontiac Bonneville
I have a 1998 pont. bonneville in the shop. Fuel pressure good after a few mins. or less it will shut off like turning the ignition off. No codes are present, when it shuts off there is no spark at coils. I have checked live data with my snap on scan tool and have cam sensor data, ect. It will eventually start, but problem appears to getting more frequent. Another shop had replaced ignition module but problem persits, now I'm trying to diagnose and repair. Could this be an ignition switch problem ?
The anti-theft system has nothing to do with spark . When it won't start check for B+ voltage at the ignition module . pin P a pink wire . Check pin K for a good ground . Check the 18X & 3X crank sensor signals to the PCM . It's good you have a snap on scan tool an can check sensor data , but to check cam an crank signal's you really need a scope ! Does your snap on tool have a lab scope ( oscilloscope ) Do you know what this is ?
How to test crank sensor on GM 3800 engine 3x and 18x signals
Do you have access to wiring diagrams ? Check electrical distribution in an out of the ignition switch .Free wiring diagrams here
http://www.bbbind.com/free_tsb.html Enter vehicle info Year , make , model and engine size . Under system click on electrical distribution , then under subsystem click on power distribution . Click the search button , then the blue link ! I wouldn't think the ignition switch being the problem but you never know without testing ! Do you know how to do automotive electrical testing with a DVOM - digital volt ohm meter ? Using a wiring diagram to pin point areas for testing ?
Electric Testing Techniques You Need to Know
TSB'S that GM may have on this car. For what ?
Posted on May 23, 2017
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Posted on Jan 02, 2017
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