1987 Pontiac Bonneville sudden stopping on the freeway

8828

MEMBER
1987 PONTIAC BONNEVILLE
6 CYL
2WD
AUTOMATIC
15,000 MILES

My car will start but after I drive approximately 20-30 miles on the freewy, the car suddenly stops and I can barely steer to the side of the road. The electrical system is still working. After resting for about 1 hour, the car starts again but this time will run fewer miles than it did before. Occasionally I have had to be towed home because it wouldn't restart at all. This happened 3 times last week. One garage put in an ignition module for $300.00. But that was not the problem because the car did it on the way home.

2 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Get the fuel pressure tested to rule out the fuel pump and comeback with the readings before we go into the ignition system. Possible causes: Coil/s, cam and crankshaft sensors-

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Tuesday, June 24th, 2008 AT 3:12 PM

MERLIN2021

MECHANIC
17,250 POSTS

I agree with Razz here's how..
Start with the basics, and work your way up, Last tune up was? Wires plugs ALL filters? If all that is ok, check for a stuck EGR, then test fuel pump pressure, If it won't restart, determine what's missing, the engine needs three things to run, Spark at all plugs, gas to all cylinders, and compression in all cylinders, tho an engine may run lacking one in one cylinder, it won't run very well!
https://www.2carpros.com/car_repair_video/test_fuel_injection_pressure.htm
Go here and checkout our video.
https://www.2carpros.com/car_repair_video/test_engine_ignition_system.htm
and this one!