hesitation/bucking
#1
hesitation/bucking
I'm having an issue with a hesitation or sporadic buck. Occurs under acceleration but only every once and a while. Only once did the check engine light come on but immediately turned off. I am suspecting my fuel pump currently as my fuel pressure will sometimes bleed off very fast as soon as the car is turned off, other times it will hold for some time. The car runs and drives great for 20min or more without issue then occasionally there is a power loss or hesitation while accelerating. FPR is new, pump currently is a 255 walbro that was installed years ago..
Can a bad or failing pump cause issues like this?
any other ideas on what to look at?
thanks for your help!
Can a bad or failing pump cause issues like this?
any other ideas on what to look at?
thanks for your help!
#2
I'm having an issue with a hesitation or sporadic buck. Occurs under acceleration but only every once and a while. Only once did the check engine light come on but immediately turned off. I am suspecting my fuel pump currently as my fuel pressure will sometimes bleed off very fast as soon as the car is turned off, other times it will hold for some time. The car runs and drives great for 20min or more without issue then occasionally there is a power loss or hesitation while accelerating. FPR is new, pump currently is a 255 walbro that was installed years ago..
Can a bad or failing pump cause issues like this?
any other ideas on what to look at?
thanks for your help!
Can a bad or failing pump cause issues like this?
any other ideas on what to look at?
thanks for your help!
#5
well I stopped at oreilly auto to pull codes, no luck. I tried both the engine bay port and the connection under the dash. Neither one would connect to the vehicle although while it was trying to connect the rpms were sitting around 1400 then 1200 like a test was being done.
In hopes it was a fuel pump issue I have dropped the tank. I found the in tank filter looks pretty gunked up and the small rubber piece on the pump hanger is ripped and falling apart... what is this orange piece on the hanger called? purpose? I am hoping I can locate one tomorrow so I can reassemble.
I also pulled spark plugs today. they all look pretty good, maybe a tad white but nothing seemed to outta line. I want to run new lines from the top of my tank to the filter/ hardlines. what size high pressure line should I get?
any more help or ideas would be great. I was told that the diagnostic port was connected to the cig lighter fuse or something? if so where is that damn thing...
In hopes it was a fuel pump issue I have dropped the tank. I found the in tank filter looks pretty gunked up and the small rubber piece on the pump hanger is ripped and falling apart... what is this orange piece on the hanger called? purpose? I am hoping I can locate one tomorrow so I can reassemble.
I also pulled spark plugs today. they all look pretty good, maybe a tad white but nothing seemed to outta line. I want to run new lines from the top of my tank to the filter/ hardlines. what size high pressure line should I get?
any more help or ideas would be great. I was told that the diagnostic port was connected to the cig lighter fuse or something? if so where is that damn thing...
#8
97% of the time the car runs and drives great, no issues. I noticed when parking slightly nose down it did not idle at start and seemed to be running oddly for a minute or 2 then it was fine, also rarely while cruising at 3k rpm in third and a relatively small push on the gas can cause the bucking. TPS is new as well
#10
don't meant to highjack your post... just wanted to get this in were there are people taking about it as well...