Question about 1998 Pontiac Bonneville

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1998 bonneville engine hesitation

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

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  • richard wang Dec 29, 2012

    i now have a connecting rod knock in the engine and it died on my way home today and will not start.

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  • Pontiac Master
  • 923 Answers

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

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Posted on Jan 02, 2017

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SOURCE: 2001 Pontiac Bonneville. Service engine soon light

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

SOURCE: Car coded yesterday p0303 noe check engine light flashing

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

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