Hesitation, Bogging, Bucking

PeTr0 · 02-16-2001, 10:32 PM

My car sputters back and forth when i hit the gas. If i take my foot off the gas after about a second it kicks back. Also when i am sitting at idle the monster tach jumps around a couple of hundred rpm..is that normal. The exhaust note sounds a little funny too. What is wrong with my car guys. Dealer said they didnt notice a problem...how could that be...

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Red 1993 Gt- flowmasters,BBK Shortie Headers, BBK Hi-Flow H-Pipe, BBK cold air induction w/K&N, Pro 5.0 shifer, 130 amp alt., underdrives,pioneer cd player and kicker component speakers, Kenwood Excelon amp, 2 12" subs in the hatch,firehawk sz50 all around, timing bumped to 13 deg., ADS Superchip, and mobil 1 oil lubing the 302.

84_GT350 · 02-17-2001, 03:21 AM

It could be running rich but the hunting idle makes me think it's a sensor problem of some sort. I'm no good at tracking sensor problems on EFI cars, but maybe the TPS sensor. That's a common cause for a hunting idle I believe....i dunno about the other symptoms.

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1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s

CJ's94GT · 02-17-2001, 09:40 AM

Have you done anything to your MAF meter? When we did my PIH I had to change the MAF to match the PIH and 30lb injectors. The MAF wasn't calibrated right and the dang thing pulled a TON of fuel out of the motor when I did anything more than idle. All kinds of pinging and knocking and other horrible noises.

NoSlow5.0 · 02-17-2001, 11:58 AM

I had the same problem. (post: car hikups under minor acceleration) It did the bucking when i let off the gas and everything, just like yours. I have a speed density 87. I took off the upper intake, cleaned it out real good along with the EGR valve. I also installed my 65mm T-body and spacer. I kept pulling a code 34. I still pull that code, but the problems are gone now. I think the code is there b/c i have a couple vaccum lines missing. I think the EGR was really crapped up and the engine was choking. Clean her out real good and see if thet helps. It did for me.

She still idles a little high but not that bad. Once again, i think that if from missing vaccum lines. Light Em Up!!

02-16-2001, 10:32 PM	#1
PeTr0 Registered Member Join Date: Jun 1999 Location: Chicago, IL, USA Posts: 286	Hesitation, Bogging, Bucking My car sputters back and forth when i hit the gas. If i take my foot off the gas after about a second it kicks back. Also when i am sitting at idle the monster tach jumps around a couple of hundred rpm..is that normal. The exhaust note sounds a little funny too. What is wrong with my car guys. Dealer said they didnt notice a problem...how could that be... ------------------ Red 1993 Gt- flowmasters,BBK Shortie Headers, BBK Hi-Flow H-Pipe, BBK cold air induction w/K&N, Pro 5.0 shifer, 130 amp alt., underdrives,pioneer cd player and kicker component speakers, Kenwood Excelon amp, 2 12" subs in the hatch,firehawk sz50 all around, timing bumped to 13 deg., ADS Superchip, and mobil 1 oil lubing the 302.

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02-17-2001, 03:21 AM	#2
84_GT350 Registered Member Join Date: Apr 1999 Location: Overland Park, KS, USA Posts: 1,631	It could be running rich but the hunting idle makes me think it's a sensor problem of some sort. I'm no good at tracking sensor problems on EFI cars, but maybe the TPS sensor. That's a common cause for a hunting idle I believe....i dunno about the other symptoms. ------------------ 1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s

02-17-2001, 09:40 AM	#3
CJ's94GT Registered Member Join Date: Feb 2001 Location: Wichita,KS Posts: 59	Have you done anything to your MAF meter? When we did my PIH I had to change the MAF to match the PIH and 30lb injectors. The MAF wasn't calibrated right and the dang thing pulled a TON of fuel out of the motor when I did anything more than idle. All kinds of pinging and knocking and other horrible noises.

02-17-2001, 11:58 AM	#4
NoSlow5.0 YOU HAVE NO MARBLES!!!!!! Join Date: Aug 2000 Location: Jonesboro,Georgia,USA (Providence, Ri) Posts: 868	I had the same problem. (post: car hikups under minor acceleration) It did the bucking when i let off the gas and everything, just like yours. I have a speed density 87. I took off the upper intake, cleaned it out real good along with the EGR valve. I also installed my 65mm T-body and spacer. I kept pulling a code 34. I still pull that code, but the problems are gone now. I think the code is there b/c i have a couple vaccum lines missing. I think the EGR was really crapped up and the engine was choking. Clean her out real good and see if thet helps. It did for me. She still idles a little high but not that bad. Once again, i think that if from missing vaccum lines. Light Em Up!!