Question about 1998 Pontiac Bonneville
Seems fine with light load on the engine.if i start climbing a hill the engine will start misfiring until i let off the throttle and lower the load on the engine. i have a PO305 code then it went to a PO303 code. i checked the plugs and wires and coils and all seems ok. I've had a few PO133 PO135 and PO141 codes in the past but all that happened was the check engine light illuminated. now i have a drivability problem. can anyone give me some suggestions before i spend money on parts that won't fix my problem? Thanks
Is there an illuminated check engine light on the dash? That sounds like a failing TPS (throttle position sensor). Unless you have low fuel pressure! When (if ever) have you replaced the fuel pump and/or fuel filter? Are you running the correct type of fuel in the engine? If you have slow or sticky fuel injectors, a can of Seafoam might help!
Posted on May 08, 2017
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
Posted on Jan 02, 2017
Hi if the check engine light is still on then the problem is still present you will have to get it scaned find out the fault code and repair that before the check engine light will go out
no you can't jump it to clear the codes it has OBD2 to clear the code you need a scan tool
hope this helps you
Posted on May 10, 2009
The only thing left is the injector or a vacuum leak on the manifold gasket sucking air in and causing a lean condition. Thats is its the only common issue providing you dont have a head gasket issue leaking coolant on that cylinder and the compression and valves are not leaking. The old spark plug should show a coolant issue if present. The white part will be shiney if you have a coolant loss. If the coolant is looking real dark you should have the cooling system checked for gas being pushed into the cooling system on compression stroke thru the head gasket.
Posted on Nov 12, 2009
Tips for a great answer:
Dec 14, 2015 | Cars & Trucks
Dec 06, 2014 | 2002 GMC Sierra 1500
Feb 15, 2014 | 2001 Volkswagen Jetta TDI
Jan 09, 2010 | 2002 Ford Ranger Regular Cab
Nov 12, 2009 | 1994 Oldsmobile Cutlass Supreme
Jul 27, 2009 | Pontiac Montana Cars & Trucks
Jun 30, 2009 | 1998 Honda Civic
Mar 16, 2009 | 1998 Ford Windstar
Aug 21, 2008 | 1997 Subaru Legacy
Jul 23, 2008 | 2009 Dodge Caliber
55 people viewed this question
Usually answered in minutes!