Question about 1998 Pontiac Bonneville
If you have a crankshaft sensor going bad, that could be it. have a parts store retrieve a trouble code, from computer, your service engine soon light came on, yes ? egr valve can cause this, spark plug wires might cause this, check distributor cap/rotor, old spark plug wires can cross fire because of shorting out. see how that works
Posted on Jan 14, 2013
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Posted on Jan 02, 2017
the code you have is for a misfire on #3 cylinder. (im sure you knew this right?). the crankshaft position sensor will not cause one individual cylinder to misfire. what i typicaly do in this scenario is switch the ignition wire off of the guilty cylinder onto a known good firing cylinder and see if misfire moves to the other cylinder. i repeat this process by switching the spark plug and finaly the fuel injector. a compression check may be in order as well (but not a likely cause) unless you have access to a tech 2 (gms diag computer) you will need to clear this code after each component is moved and see if you get a new code ie :p0304 if switched to #4 cylinder..other wise if you do have access to a computer that has a misfire chart in its features you can quickly identify the guilty component. as i side note the ignition coil may also be faulty, but i believe your vehicle has a 3.8liter meaning that it has a coil pack....switch the others i listed and see ow you make out....good luck!
Posted on Jun 11, 2009
SOURCE: 2000 pontiac sunfire misfire
Solution is in the wiring harness....these cars are noted for this as it runs under the rad exposing it to the elements and corrosion. You will need a dealer with the proper scanner to read the code & find the wire.
Posted on Dec 31, 2009
MASS AIR FLOW CAN CAUSE PROBLEMS IF ITS DIRTY OR SKEWED .YOUR IDLE AIR INLET PASSAGES OR THROTTLE BORE IS DIRTY OR FULL OF DEPOSITS.BESURE REPLACE EGR VALVE GASKET THE OLD GASKET WILL LEAK.CHECK FOR THROTTLE PLATE THROTTLE SHAFT OR LINKAGE IS DAMAGED OR STICKING.
Posted on Dec 30, 2010
Testimonial: "THANKS. Going to pull it in the shop this weekend and not leaving until I figure it out or blow it up! LOL"
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