weird miss and no throttle response
09-21-2009, 11:14 PM
#1
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weird miss and no throttle response the car will start spuddering under part throttle and seems to have a miss. but when it does it the afr goes to lean. could this be a bad opti, or maybe a blown head gasket or something. im clueless. please help
i have changed computers, MAF, went to ac delco o2 sensors, e3 spark plugs. what else would u suggest
i have changed computers, MAF, went to ac delco o2 sensors, e3 spark plugs. what else would u suggest
09-21-2009, 11:34 PM
#4
Check your fuel delivery, put a pressure gauge on the rail. check your relay/pump/filter. Also, check to make sure your wires are all in and check the opti. also give the egr a check. did you check for codes?
09-21-2009, 11:52 PM
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do u think this might be my problem?
the car is a 97 and it has a new fuel pump and injectors, and filter. all the wires are fine.
as far as codes i havnt got them checked since i put the new computer in but it was throwing a code for the maf and the speed sensor i think.
the car runs fine at wot, the afr goes to normal. except sometimes it will just spudder and die at wot
the car is a 97 and it has a new fuel pump and injectors, and filter. all the wires are fine.
as far as codes i havnt got them checked since i put the new computer in but it was throwing a code for the maf and the speed sensor i think.
the car runs fine at wot, the afr goes to normal. except sometimes it will just spudder and die at wot
09-22-2009, 12:06 AM
#7
To be perfectly honest it still sounds like fuel delivery, I went through 4 pumps before I got a good one. You need to check your rail pressure! You could have a bad fuel pressure regulator. You could be sucking all the gas from the rail and the regulator may not be keeping up, possibly a bad spring inside.
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09-22-2009, 12:09 AM
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no kidding? that sucks. i hope its not the fel delivery part. that dange fuel pump is a pita. i have a walboro 255 in it now. the car usually runs perfectly fine on start up then if i open it up once it starts acting funny
09-22-2009, 12:15 AM
#10
09-22-2009, 04:23 PM
#12
We could have a fuel pump change race, cause I think I can go sub 20 mins! Sorry for sort of hijacking the thread with some f-body humor kalebm22. But seriously, I'd look to the fuel system for the problems. Try checking the regulator next because a walboro SHOULDN'T act up but who knows. Do you have an adjustable regulator?
09-22-2009, 06:23 PM
#13
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lean conditions dont mean spark issues. i had a walboro crap out in less than 3k miles and did the same thing. while i was changing the pump i also discovered it was losing voltage at the pump itself (fine at the relay) so until i correct that i will be going through fuel pumps every couple months.
09-22-2009, 07:53 PM
#14
lean conditions dont mean spark issues. i had a walboro crap out in less than 3k miles and did the same thing. while i was changing the pump i also discovered it was losing voltage at the pump itself (fine at the relay) so until i correct that i will be going through fuel pumps every couple months.
09-22-2009, 08:44 PM
#15
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no, just a drop in walboro 255 that i want to say was part of a granetelli (sp?) kit but i dont remember. the replacement came out of my 94 since the motor is in pieces now. gonna check for better grounds before i change up the wiring from the relay in the kick panel. anyway i just wanted to bring the experience as a possibility to the attention of the thread starter
09-23-2009, 01:08 AM
#16
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lean conditions dont mean spark issues. i had a walboro crap out in less than 3k miles and did the same thing. while i was changing the pump i also discovered it was losing voltage at the pump itself (fine at the relay) so until i correct that i will be going through fuel pumps every couple months.
09-23-2009, 01:15 AM
#17
Autozone for a stock replacement (about $35-40). Go to summit or WS6store for an aeromotive adjustable (about $165). The pump relay is behind the drivers side kick panel right behind the hood release. I believe the voltage should be at 12.
09-25-2009, 01:50 AM
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I would be willing to bet it is an ignition issue! Check to see if you have a wire arcing off of something, or maybe your opti is on its way out. Just cause the computer is saying its lean does not mean you have a fuel system problem. If the O2 sensor sniffs to much oxygen, it will tell the computer its too lean, even if there is raw fuel spilling out the exhaust pipe. P.S. when most opti's die, the first symptoms are backfiring, rough idle, and a miss under load.
