My rainier has an engine miss but the check engine light is not on. What should I look for? I put new plugs in and filled the tank and added some Seafoam to the fuel.
Year : 2005
Make : Buick
Year (other): 2005
Make (other): Buick
I replaced the plugs and put some Seafoam in the tank with some fresh fuel.
Welcome to JustAnswer, my name is XXXXX XXXXX X'X here to help get your problem resolved. How many miles are on it? Does it miss at all speeds? Worse under any speeds/conditions? Did it slowly get worse or come at once? ThanksDan41095.9523723032
It has 103.000 mile on it i just notice it at idle in gear w/ ac on high speed it feels fine
Thanks for the update Terry, to me it sounds like throttle body is dirty causing it to idle a little low which may feel like a miss and also explains check engine light not comming on. You can get some throttle body cleaner from your local parts store and use that with a rag to cleap out throttle body and behind throttle plate as good as possible. Let me know if you have any questions at all, thanks.
Okay, I can try that. Is the throttle body underneath the air cleaner?
Correct, the throttle body is where the air cleaner tube connects to engine. So remove intake tube from engine and clean out throttle body with cleaner and rag. Let me know how it goes or if you have any questions, thanks.
Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
Dan, I am sorry about the delay in my response but I had to leave town on Monday. To catch you up I have cleaned the throttle body several times, the last taking a small brush and cleaning the insides the best I could with out removing it. I am still experiencing the miss. I will be back home where I can look it to it further on Thursday the 12th. Thanks Terry
Does it actually seem to misfire or just idle low? If you press down on the gas a little does it run fine?
It does not act like a misfire and when I raise the idle it will go away. When I first start the car in the morning and it is idling a little faster it seems fine , moving at 10 mile an hour and up it's ok just misses at idle
Ok, it sounds like you have a vacuum leak or failed idle air control valve. In the morning spray water or starting fluid around vacuum lines, throttle body gasket, intake gaseket ect to see if idle changes if so that means you have a leak in area your spraying. If good replace the idle speed actuator. Let me know how it goes, thanks.
Dan, I have been working with the Buick Rainier off and on with out being able to determine what is the problem. It doesn't seem to have a vaccum leak and the Idle air control valve is apart of the Throttle body and throttle posission sensor it is a expensive part to replace with out determining it is the problem. Yesterday there was an error code 303 ( misfire 3 cylinder) so I replaced the #3 spark plug and it is doing better. I was going to change Throttle body with my daughters car (same year and make) But after the improvement I thought I would give this a try.
The throttle body doesnt usually caused individual cylinder misfires, that would be more likely injector or intake gasket. Let me know how it goes or if you run into questions. Thanks.