Okay guys. What could it be?

coupe · 03-13-2006, 09:59 AM

Car still pings when 1) at operating temperature and 2) over about 1/4 throttle (or under load up hill).

It runs fine and hauls ass when it's still cold, but once it gets up to normal temp...I have to be very judicious with throttle position. It's driving me nuts. Here's what I've replaced:

O2-sensors,
TPS,
plugs (colder too),
wires,
distributor,
fuel pump,
filter,
MAF electronics (itsa C&L),
Checked resistances in ACT and CTS...they're within normal.
Tried different gas-stations and fuel injector cleaner...nada.
Also have retarded base timing to 8...still does it; just runs hotter.
The Balancer is a sealed SFI fluid piece.

It started doing this gradually over a weeks-time after I changed to an electric fan.

Car didn't show hot on gauge, but I wnet back to clutch fan instead...no help.

? ? ? ? Sorry to bring up this old topic. Does anyone have a ProM for 24# injectors I can try? That's about the last thing it could be

86GT · 03-13-2006, 12:48 PM

Try unpluging the CTS (ECT) sensor and let it fail. The EEC will default to something like 210 and see if that helps. Just by doing a simple resistance check is not enough. This also applies to the ACT sensor.

coupe · 03-13-2006, 03:11 PM

Okay, I have unplugged each. separately. then started car. no different.

Checking the EGR vacuum (EVR) next to see if it's working. Found out the EEC will lean mixture if it senses the EGR is open...maybe it's sticking open and the thing is leaning a bit much

The ping I heard today was definitely a lean-"crack" sound...head gaskets still there tho

slvrbullit · 03-13-2006, 03:30 PM

I have that 75mm ProM that is called for 30's that I am not using.

86GT · 03-13-2006, 04:13 PM

The EGR will create a lean condition as you stated. Not to sure what the EEC does if it senses a bad EGR. Try disabling it in the tuner. I can not remember, do you have a Tweecer. If so can you datalog?

QWKSNKE · 03-13-2006, 05:35 PM

Quote:

Originally Posted by 86GT

The EGR will create a lean condition as you stated. Not to sure what the EEC does if it senses a bad EGR. Try disabling it in the tuner. I can not remember, do you have a Tweecer. If so can you datalog?

no he does not

86GT · 03-13-2006, 08:12 PM

Just thinking out loud but if an injector is stuck open, the EEC will sense this and try to lean out the mixture causing the rest to go lean.

I would also try running a cylinder balance test.

LeeH · 03-13-2006, 08:43 PM

EGR is not functional except at part throttle cruise, Idle and WOT are not effected unless the EGR valve is stuck.

Dale McPeters · 03-13-2006, 09:30 PM

Quote:

Originally Posted by LeeH

EGR is not functional except at part throttle cruise, Idle and WOT are not effected unless the EGR valve is stuck.

Correct one attay boy for you...now get back out in the garage
and get that car finished up.....

jwillburn119 · 03-14-2006, 06:45 AM

hey, check inside your distributor... all the way down to the hall effect sensor, and the CPS sensor... it is inside the distributor... so you might have to take the distributor off... just a thought... thats what mine was doing and i tore it down... 3 times in a row.. because of it

03-13-2006, 09:59 AM	#1
coupe Super Moderator Join Date: Dec 2004 Posts: 6,313	Okay guys. What could it be? Car still pings when 1) at operating temperature and 2) over about 1/4 throttle (or under load up hill). It runs fine and hauls ass when it's still cold, but once it gets up to normal temp...I have to be very judicious with throttle position. It's driving me nuts. Here's what I've replaced: O2-sensors, TPS, plugs (colder too), wires, distributor, fuel pump, filter, MAF electronics (itsa C&L), Checked resistances in ACT and CTS...they're within normal. Tried different gas-stations and fuel injector cleaner...nada. Also have retarded base timing to 8...still does it; just runs hotter. The Balancer is a sealed SFI fluid piece. It started doing this gradually over a weeks-time after I changed to an electric fan. Car didn't show hot on gauge, but I wnet back to clutch fan instead...no help. ? ? ? ? Sorry to bring up this old topic. Does anyone have a ProM for 24# injectors I can try? That's about the last thing it could be __________________ " If you can't explain it simply, you don't understand it well enough. " - Albert Einstein

03-13-2006, 12:48 PM	#2
86GT Member Join Date: Mar 2005 Location: Sacramento California Posts: 449	Re: Okay guys. What could it be? Try unpluging the CTS (ECT) sensor and let it fail. The EEC will default to something like 210 and see if that helps. Just by doing a simple resistance check is not enough. This also applies to the ACT sensor. __________________ EEC Analyzer A9M, TwEECer, 306ci, 73mm C&L w Tuner Tube, Cobra Intake, 42# inj, Edelbrock 6037, E303 cam, 155 fuel pump, FPR, 70mm TB, E-Fan, 3.55 gears, Powerdyne 9psi actual 5psi...way more.

03-13-2006, 03:11 PM	#3
coupe Super Moderator Join Date: Dec 2004 Posts: 6,313	Re: Okay guys. What could it be? Okay, I have unplugged each. separately. then started car. no different. Checking the EGR vacuum (EVR) next to see if it's working. Found out the EEC will lean mixture if it senses the EGR is open...maybe it's sticking open and the thing is leaning a bit much The ping I heard today was definitely a lean-"crack" sound...head gaskets still there tho __________________ " If you can't explain it simply, you don't understand it well enough. " - Albert Einstein

03-13-2006, 03:30 PM	#4
slvrbullit Super Moderator Join Date: Dec 2004 Location: on the water Posts: 1,280	Re: Okay guys. What could it be? I have that 75mm ProM that is called for 30's that I am not using. __________________ 2012 Jeep Wrangler Unlimited--- too many mods to list, about to be sitting on 1 ton axles. 2000 Ford F-350 Dually Lariat LE Crew Cab Short Box 7.3 auto 168,000 miles

03-13-2006, 04:13 PM	#5
86GT Member Join Date: Mar 2005 Location: Sacramento California Posts: 449	Re: Okay guys. What could it be? The EGR will create a lean condition as you stated. Not to sure what the EEC does if it senses a bad EGR. Try disabling it in the tuner. I can not remember, do you have a Tweecer. If so can you datalog? __________________ EEC Analyzer A9M, TwEECer, 306ci, 73mm C&L w Tuner Tube, Cobra Intake, 42# inj, Edelbrock 6037, E303 cam, 155 fuel pump, FPR, 70mm TB, E-Fan, 3.55 gears, Powerdyne 9psi actual 5psi...way more.

03-13-2006, 08:12 PM	#7
86GT Member Join Date: Mar 2005 Location: Sacramento California Posts: 449	Re: Okay guys. What could it be? Just thinking out loud but if an injector is stuck open, the EEC will sense this and try to lean out the mixture causing the rest to go lean. I would also try running a cylinder balance test. __________________ EEC Analyzer A9M, TwEECer, 306ci, 73mm C&L w Tuner Tube, Cobra Intake, 42# inj, Edelbrock 6037, E303 cam, 155 fuel pump, FPR, 70mm TB, E-Fan, 3.55 gears, Powerdyne 9psi actual 5psi...way more.

03-13-2006, 08:43 PM	#8
LeeH Senior Member Join Date: Dec 2005 Location: The conservative underground Posts: 341	Re: Okay guys. What could it be? EGR is not functional except at part throttle cruise, Idle and WOT are not effected unless the EGR valve is stuck. __________________ 89LX Hatch 89LX Coupe 89GT 90GT 93GT

03-14-2006, 06:45 AM	#10
jwillburn119 Senior Member Join Date: May 2005 Location: temple, tx Posts: 240	Re: Okay guys. What could it be? hey, check inside your distributor... all the way down to the hall effect sensor, and the CPS sensor... it is inside the distributor... so you might have to take the distributor off... just a thought... thats what mine was doing and i tore it down... 3 times in a row.. because of it __________________ Whats in your WALLET?