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 Post subject: 1998 SE P0300 misfire
PostPosted: Sun May 05, 2013 3:10 pm 
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Joined: Sun May 05, 2013 2:25 pm
Posts: 2
Location: Missouri
Year and Trim: 1998 Pontiac Bonneville SE
I seem to be hitting a brick wall. My Bonny is idling rough and I've had it in to a mechanic as well as replacing parts on my own and we can't seem to fix it. So far I've had the following replaced:

Radiator
Upper and Lower hoses
Thermostat and housing
Camshaft Position Sensor
Plastic Elbow on belt tensioner due to AF leak
Spark Plugs - Wires are good
PCV Valve
Fuel Filter
Intake Air Control Valve
Air Filter
Catalytic Converter
Upstream O2 Sensor

I've also checked for vacuum leaks. None found. I've run fuel system cleaner through it. Nothing seems to be improving the issue so far.
She always starts up but idles rough. Battery is holding strong at 14.7 volts. At cruising speed either around town or on the highway the idle feels as close to normal as it could be. Acceleration is a little rough and seems to be lacking some power. Also at idle I notice there is a pretty strong fuel smell, but have found no fuel leaking.

I'm at a loss here. She's been a great car until recently and I really hate to get rid of her.


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PostPosted: Mon May 06, 2013 10:49 am 
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Certified Bonneville Nut
Certified Bonneville Nut
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Joined: Mon May 10, 2010 6:11 pm
Posts: 9495
Location: Chicago, IL
Year and Trim: 2003 SLE
Check the ignition coils and the ignition control module. When those fail, they cause your symptoms.

I'm not sure on the fuel smell, can you pinpoint at least where the smell is coming from?

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"Penelope" - 2003 SLE - 247k Miles
"Sydney" - 2000 Honda S2000 - 98k miles
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PostPosted: Mon May 06, 2013 8:23 pm 
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Joined: Sun May 05, 2013 2:25 pm
Posts: 2
Location: Missouri
Year and Trim: 1998 Pontiac Bonneville SE
Thanks Carl! Any idea what the range would be for a coil to test good or bad? I tested each coil pack on the secondary post with my multimeter and the readings were as follows:

Set to 20k ohms

4/1 - 5.71
2/5 - 5.81
6/3 - 5.70

I didn't have a 7/32" socket to remove the coils to test the primary sides.

As for the strong fuel smell it's coming from the exhaust pipe.


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PostPosted: Mon May 06, 2013 9:40 pm 
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GXP Member
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Joined: Wed Nov 07, 2012 3:35 am
Posts: 220
Location: IL
Year and Trim: 2002 SSEI "Twitch"
Intense LIII
Could also be Coils/ICM, Leaky FPR, Leaky injector. Or, wait for it... Bad Plenum or Plenum gasket or LIM gasket.

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2002 SSEI "Twitch"
INTENSEā„¢ Fenderwell Intake Kit
INTENSEā„¢ Modular Pulley System with 3.40" Pulley -
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