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hesitation

Toms04compg

Toms04compg

New member
My car seems to be hesitating its an 04 gtp with 9k on engine rebuild. I've been chasing this hesitation I have a cel p0300 now I left my do a little loose from rear manifold its been that way for a while with little hesitation. Is it possible I'm getting this bucking from the down pipe nit being all the way tight? I've changed plugs autolite 606 and cleaned tb this car is stock. Its loose because it sounded a little meaner while highway cruising.
 


It's possible. I have been trying to eliminate a P0300 and what appeared to be an intermittent vacuum leak for a couple of weeks. I found that my exhaust pipe (1st joint after the CAT) wasn't sealing completely. I put a band clamp on it 2 days ago, and miracle of miracles, it has solved everything! Never would have found it if I didn't have it on a lift for some suspension work.
 
It doesn't do it when cold... this morning in Michigan was 38 degrees and I have a 30 min commute... not one hesitation or buck .... when I would get like 20 times normally
 
makes sense. If it IS air getting into your downpipe, the colder, more dense air probably wouldn't "creep in" to your DP as much as warmer air. Just my .02 :)
Tighten your DP up and see, worse that could happen is no change
 
Well I put a bottle of seafoam that I had laying around, I dumped half a bottle in about a 1/4 tank drove it for like 5 miles like that. Sat overnight then I pumped a little more gas 93 like always. Looks like its good to go, wires are still next as these might be stock wires... there Delphi idk.
 


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