Super complex problem Need some experts to help

gotn20 · April 7th, 2009, 05:06 PM

Ok so i've had this problem with my car for over 6 months where it's like it has two modes. When it's cold or partialy warmed up it runs perfect. When it warm it runs like shit. Just ideling it will be intake backfireing, won't idle higher than like 600 rpm, with abrupt throttle changes it'll pop and surge and take off, While driving it runs fine but if i lift off the gas it'll just obnoxiously pop out the exhaust like an old dump truck or some shit. I thought it was cause I had a cam and was speed density so I converted to mass air and it didn't change a bit. I've tried 3 tps's, 2 coils,2 bap sensor, 1 map sensor, new wires, cap and rotor, new walboro fuel pump, used fpr that I bought from e3sean and i have a pretty new tfi. It seem like it would be timing but I've double and tripple checked it. There has to be something that can be affected by heat that can affect timing. The only thing I can think is my tfi. It's just weird cause it's almost like two modes in a comp or something cause some times i can turn the car off and restart it and it runs fine for couple of minutes but i now have a brand new a9l and mass air meter. I know it's not a problem with the conversion cause it's the same problem as before my car just idles right when it's running good cause of the conversion. I'm so lost guys please help I've been batteling this shit for 6 months. Maybe a coolant temp sensor, or cause i have a 160 tstat. Fuck i don't know

93mustank · April 7th, 2009, 05:19 PM

Open to closed loop.....run codes....look into the o2 sensors..

91Project · April 7th, 2009, 05:22 PM

Checked your plugs recently? what do you have them gapped at?

gotn20 · April 7th, 2009, 05:52 PM

oh my god I've totally spaced my 02's how do you check codes on these cards. I've never done it cause I heard it works differently with speed density computers. Now I have the a9l. It's a nitrous car so I change my plugs all the time. There usualy gapped at .035

93mustank · April 7th, 2009, 05:56 PM

Here you go..... You will get two digit codes...will be easy to do....
Do the koeo test and the koer test(engine running)

Report back

gotn20 · April 7th, 2009, 06:11 PM

i dont think the link showed

93mustank · April 7th, 2009, 06:25 PM

oops
DIY KOEO/KOER/Cylinder Balance Self-Test Procedure

gotn20 · April 7th, 2009, 06:34 PM

ok sorry mustank new problem, My check engine light doesn't work since I converted to the a9l. I thought I saw a thread a while back on how you could use a analog voltage meater is this true?

dr.gonzo! · April 7th, 2009, 06:36 PM

or a 12volt test light

gotn20 · April 7th, 2009, 06:36 PM

phhh sorry maybe I should read first huh. Thanks bro. Think the 02's could really make my car run that bad?

fastford3388 · April 8th, 2009, 01:24 PM

not to jack your thread, but mine has been doing the EXACT same thing recently! i was getting a code 91, which led back to my HEGO. computer is telling me O2 sensors as well...
Does your problem go away after you've been driving for a few minutes? once my 180 degree t-stat opens up it seems to stop the popping and power surges. let me know what your codes are and what you end up doing, i'm getting the same thing here and my fuel mileage has suffered from it as well.

ryans88gt · April 8th, 2009, 01:45 PM

coolant temp sensor for the computer. The one mounted in the black metal coolant tube.

Replace it.

gotn20 · April 8th, 2009, 02:03 PM

black metal coolant tube? Not the one on the lower mani?

Smirnoff · April 8th, 2009, 02:26 PM

yes the black coolant tube for the heater hose

93hatch · April 8th, 2009, 02:59 PM

Originally Posted by gotn20

black metal coolant tube? Not the one on the lower mani?

i think thats what he meant

fastford3388 · April 8th, 2009, 04:34 PM

my coolant temp sensor is new...

any other reasons why it would do that??

April 7th, 2009, 05:06 PM	#1
gotn20 Atomized Join Date: Feb 2008 Posts: 1,370 iTrader: 0 reviews	Super complex problem Need some experts to help Ok so i've had this problem with my car for over 6 months where it's like it has two modes. When it's cold or partialy warmed up it runs perfect. When it warm it runs like shit. Just ideling it will be intake backfireing, won't idle higher than like 600 rpm, with abrupt throttle changes it'll pop and surge and take off, While driving it runs fine but if i lift off the gas it'll just obnoxiously pop out the exhaust like an old dump truck or some shit. I thought it was cause I had a cam and was speed density so I converted to mass air and it didn't change a bit. I've tried 3 tps's, 2 coils,2 bap sensor, 1 map sensor, new wires, cap and rotor, new walboro fuel pump, used fpr that I bought from e3sean and i have a pretty new tfi. It seem like it would be timing but I've double and tripple checked it. There has to be something that can be affected by heat that can affect timing. The only thing I can think is my tfi. It's just weird cause it's almost like two modes in a comp or something cause some times i can turn the car off and restart it and it runs fine for couple of minutes but i now have a brand new a9l and mass air meter. I know it's not a problem with the conversion cause it's the same problem as before my car just idles right when it's running good cause of the conversion. I'm so lost guys please help I've been batteling this shit for 6 months. Maybe a coolant temp sensor, or cause i have a 160 tstat. Fuck i don't know

April 7th, 2009, 05:19 PM	#2
93mustank Banned Join Date: Aug 2008 Location: Phoenix,AZ Posts: 3,014 iTrader: 1 reviews	Open to closed loop.....run codes....look into the o2 sensors.. __________________ PeteAndersonRacing.com

April 7th, 2009, 05:22 PM	#3
91Project Regular 1991 Mustang GT Join Date: Mar 2009 Posts: 144 iTrader: 0 reviews	Checked your plugs recently? what do you have them gapped at? __________________ AutoMeter C2 Nitrous Guage FS PM for details

April 7th, 2009, 05:56 PM	#5
93mustank Banned Join Date: Aug 2008 Location: Phoenix,AZ Posts: 3,014 iTrader: 1 reviews	Here you go..... You will get two digit codes...will be easy to do.... Do the koeo test and the koer test(engine running) Report back __________________ PeteAndersonRacing.com

April 7th, 2009, 06:25 PM	#7
93mustank Banned Join Date: Aug 2008 Location: Phoenix,AZ Posts: 3,014 iTrader: 1 reviews	oops DIY KOEO/KOER/Cylinder Balance Self-Test Procedure __________________ PeteAndersonRacing.com

April 7th, 2009, 05:52 PM	#4
gotn20 Atomized Join Date: Feb 2008 Posts: 1,370 iTrader: 0 reviews	oh my god I've totally spaced my 02's how do you check codes on these cards. I've never done it cause I heard it works differently with speed density computers. Now I have the a9l. It's a nitrous car so I change my plugs all the time. There usualy gapped at .035

April 7th, 2009, 06:11 PM	#6
gotn20 Atomized Join Date: Feb 2008 Posts: 1,370 iTrader: 0 reviews	i dont think the link showed

April 7th, 2009, 06:34 PM	#8
gotn20 Atomized Join Date: Feb 2008 Posts: 1,370 iTrader: 0 reviews	ok sorry mustank new problem, My check engine light doesn't work since I converted to the a9l. I thought I saw a thread a while back on how you could use a analog voltage meater is this true?

April 7th, 2009, 06:36 PM	#10
gotn20 Atomized Join Date: Feb 2008 Posts: 1,370 iTrader: 0 reviews	phhh sorry maybe I should read first huh. Thanks bro. Think the 02's could really make my car run that bad?

April 8th, 2009, 01:24 PM	#11
fastford3388 Regular 1991 Mustang GT Join Date: Feb 2007 Location: Lisle, IL Posts: 367 iTrader: 0 reviews	not to jack your thread, but mine has been doing the EXACT same thing recently! i was getting a code 91, which led back to my HEGO. computer is telling me O2 sensors as well... Does your problem go away after you've been driving for a few minutes? once my 180 degree t-stat opens up it seems to stop the popping and power surges. let me know what your codes are and what you end up doing, i'm getting the same thing here and my fuel mileage has suffered from it as well. __________________ - '90 Mustang LX-Sold "Debbie" - '89 Mustang GT- Deceased "Lucy" - '91 Mustang GT-70,000 mi "The Unicorn"

April 8th, 2009, 01:45 PM	#12
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	coolant temp sensor for the computer. The one mounted in the black metal coolant tube. Replace it. __________________ 88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

April 8th, 2009, 02:03 PM	#13
gotn20 Atomized Join Date: Feb 2008 Posts: 1,370 iTrader: 0 reviews	black metal coolant tube? Not the one on the lower mani?

April 8th, 2009, 02:26 PM	#14
Smirnoff Enthusiast 1982 GT t-top no proof of purchase Join Date: May 2008 Location: N.E.PA Posts: 717 iTrader: 0 reviews	yes the black coolant tube for the heater hose

April 8th, 2009, 04:34 PM	#16
fastford3388 Regular 1991 Mustang GT Join Date: Feb 2007 Location: Lisle, IL Posts: 367 iTrader: 0 reviews	my coolant temp sensor is new... any other reasons why it would do that?? __________________ - '90 Mustang LX-Sold "Debbie" - '89 Mustang GT- Deceased "Lucy" - '91 Mustang GT-70,000 mi "The Unicorn"

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