uggh, car is backfiring again. - Original Pony Car

**aar0s** · 10-20-2009, 09:53 PM

I changed the fuel filter and ran some seafoam through it a few weeks ago and the backfire (through the intake) went away but i got gas at a different station than usual two days ago and almost immediately it came back:bang:
Guess its time for more seafoam.
anyone think of what else it might be, it seems like a fuel problem but i thought that a backfire through the intake was a timeing problem but my timeing is at 12, checked it about a month ago.

**94gtfreak** · 10-21-2009, 01:55 AM

Maybe an injector is bein told to stay open a lil longer than it should.

(I actually have no idea....just a stab in the dark, hope it helps!)

**BlownFiveLiter** · 10-21-2009, 09:13 AM

You say your timing is set at 12?, but how does your balancer look? It's possible the outer ring may have slipped a little and 12? is actually more.

**aar0s** · 10-21-2009, 01:32 PM

thats what we were thinking but it looked good. the problem only came back after i had got gas somewhere other than my regular place. and the new place has a rep for selling the foul fuel.

Torq armd twinscrew · 10-21-2009, 03:31 PM

compression check, is where i would start.

**aar0s** · 10-21-2009, 05:23 PM

thats something ive been meaning to do anyway, kinda had it on the books for this winter when i change the valve springs, 1.7's and stock springs with 95k on em! yuck.

**BlownFiveLiter** · 10-21-2009, 07:56 PM

How about codes? Any come up for EGR? That can be a cause for detonation/backfiring, too.

**aar0s** · 10-21-2009, 08:21 PM

not in a while they havent, i had some but changed the thing on the pass strut tower and the thing on the back of the egr that bolts to the back of the TB (cant for the life of me think of the names of these things) and the codes went away. the only one i get now is the nuteral/clutch safety switch, car use to be a five speed but its auto now so no clutch for having switch for safety, er, yeh that.
put a can of heat and some new gas in it, im hopeing that fixes it. darn it, the only way to know is to drive it.

**aar0s** · 10-22-2009, 05:34 PM

ok talked to a guy that works at the station today, told me they get the octaine up from 87 to 89 by adding E85. so me and my boss is talking and he said that e-85 draws moisture like crazy. so's im betting that i got a big half tank thats got alot of water in it. Its acting better now that the heat and the non-alcohol 92 oct. is in the tank.

Torq armd twinscrew · 10-23-2009, 05:13 AM

Quote:

Originally Posted by aar0s

ok talked to a guy that works at the station today, told me they get the octaine up from 87 to 89 by adding E85. so me and my boss is talking and he said that e-85 draws moisture like crazy. so's im betting that i got a big half tank thats got alot of water in it. Its acting better now that the heat and the non-alcohol 92 oct. is in the tank.

Adding E-85 huh? Them motha effers! That might explain why at certain stations that i get gas from will make my car run leaner than others. I have been checking with a dual channel wideband, and have seen almost a 1/2 a point in my AFR on both sides of the motor.

**aar0s** · 10-23-2009, 12:53 PM

if the pump is marked that its 10% blended then thats how they get the octaine up. ive got a station close by that sells 92 non-ethonl gas, thats the only thing going in my car from now on.

10-20-2009, 09:53 PM	#1 (permalink)
aar0s OPC Staff Join Date: Jul 2011 Posts: 602	uggh, car is backfiring again. I changed the fuel filter and ran some seafoam through it a few weeks ago and the backfire (through the intake) went away but i got gas at a different station than usual two days ago and almost immediately it came back:bang: Guess its time for more seafoam. anyone think of what else it might be, it seems like a fuel problem but i thought that a backfire through the intake was a timeing problem but my timeing is at 12, checked it about a month ago.

10-21-2009, 01:55 AM	#2 (permalink)
94gtfreak OPC Staff Join Date: Jul 2011 Posts: 347	Maybe an injector is bein told to stay open a lil longer than it should. (I actually have no idea....just a stab in the dark, hope it helps!) __________________

10-21-2009, 09:13 AM	#3 (permalink)
BlownFiveLiter OPC Staff Join Date: Jul 2009 Location: Chicago 'burbs Posts: 587	You say your timing is set at 12?, but how does your balancer look? It's possible the outer ring may have slipped a little and 12? is actually more. __________________ Matt 1995 Mustang GT Mustang's Mods Vortech V2SQ \| TFS Twisted Wedge heads \| TFS 51402000 (stage 1) cam \| Typhoon intake 70mm throttle body \| SCT BA-2400 MAF \| Siemens 60lb. injectors \| Dual 255lph fuel pumps TwEECer RT \| MAC off road X-pipe \| Flowmaster 2 chamber mufflers Cobra front brakes \| 2000 Cobra R wheels \| 96-98 export taillights

10-21-2009, 07:56 PM	#7 (permalink)
BlownFiveLiter OPC Staff Join Date: Jul 2009 Location: Chicago 'burbs Posts: 587	How about codes? Any come up for EGR? That can be a cause for detonation/backfiring, too. __________________ Matt 1995 Mustang GT Mustang's Mods Vortech V2SQ \| TFS Twisted Wedge heads \| TFS 51402000 (stage 1) cam \| Typhoon intake 70mm throttle body \| SCT BA-2400 MAF \| Siemens 60lb. injectors \| Dual 255lph fuel pumps TwEECer RT \| MAC off road X-pipe \| Flowmaster 2 chamber mufflers Cobra front brakes \| 2000 Cobra R wheels \| 96-98 export taillights

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10-21-2009, 01:32 PM	#4 (permalink)
aar0s OPC Staff Join Date: Jul 2011 Posts: 602	thats what we were thinking but it looked good. the problem only came back after i had got gas somewhere other than my regular place. and the new place has a rep for selling the foul fuel.

10-21-2009, 03:31 PM	#5 (permalink)
Torq armd twinscrew Member Join Date: Aug 2009 Posts: 59	compression check, is where i would start.

10-21-2009, 05:23 PM	#6 (permalink)
aar0s OPC Staff Join Date: Jul 2011 Posts: 602	thats something ive been meaning to do anyway, kinda had it on the books for this winter when i change the valve springs, 1.7's and stock springs with 95k on em! yuck.

10-21-2009, 08:21 PM	#8 (permalink)
aar0s OPC Staff Join Date: Jul 2011 Posts: 602	not in a while they havent, i had some but changed the thing on the pass strut tower and the thing on the back of the egr that bolts to the back of the TB (cant for the life of me think of the names of these things) and the codes went away. the only one i get now is the nuteral/clutch safety switch, car use to be a five speed but its auto now so no clutch for having switch for safety, er, yeh that. put a can of heat and some new gas in it, im hopeing that fixes it. darn it, the only way to know is to drive it.

10-22-2009, 05:34 PM	#9 (permalink)
aar0s OPC Staff Join Date: Jul 2011 Posts: 602	ok talked to a guy that works at the station today, told me they get the octaine up from 87 to 89 by adding E85. so me and my boss is talking and he said that e-85 draws moisture like crazy. so's im betting that i got a big half tank thats got alot of water in it. Its acting better now that the heat and the non-alcohol 92 oct. is in the tank.

10-23-2009, 12:53 PM	#11 (permalink)
aar0s OPC Staff Join Date: Jul 2011 Posts: 602	if the pump is marked that its 10% blended then thats how they get the octaine up. ive got a station close by that sells 92 non-ethonl gas, thats the only thing going in my car from now on.