Okay guys. What could it be? - Page 4

QWKSNKE · 03-16-2006, 06:57 PM

Have you tried throwing some octane boost in to see if it will go away

nxcoupe · 03-16-2006, 09:02 PM

I am certain the mass air is the culprit, causing the load calculations to be way off. I would say the cooler air is causing the computer to give more advance because of the IAT spark adder. It is doing it in closed loop too, so the mass air is my suspect. Try spinning the mass air in the intake ductwork, move it 30 degrees at a time in the same direction even though you have a conical filter. If the pinging goes away, you know you are getting better readings of the incoming air. Right now it is seeing less load, and giving less fuel and more spark accordingly. Good luck. Put that ProM on and see what happens. Also, check the fuel pressure with a different gauge, that happened on a customer's car once.

coupe · 03-17-2006, 07:09 AM

I think I fixed it.

We'll see how it does as the day warms up, but it did much better this morning.

93Cobra#2771 · 03-17-2006, 08:55 AM

Don't just tease us, tell us what you did...

coupe · 03-17-2006, 11:49 AM

N/M.

Still doing it...not as bad. It's the MAF...trying something else before writing off the C&L.

snakebit95 · 03-17-2006, 03:47 PM

Quote:

Originally Posted by coupe

N/M.

Still doing it...not as bad. It's the MAF...trying something else before writing off the C&L.

Hey Coupe,
Are you running an aftermarket ignition? Not to stray you away from the MAF, but I had a similar problem when my car was still EFI. I installed an MSD-6AL ignition box, and started having detonation problems. It took me forever to diagnose the problem to being noise in the trigger wire that ran between the MSD and the coil. I installed some wire shielding around the trigger wire and grounded the shielding to the chassis......and problem solved. Mine always seemed temperature dependant too. It ran good when cold, but acted-up when warm. Just thought I would give you something else to think about.

snakebit95 · 03-17-2006, 03:51 PM

Oh, something else to add.......are you running a cold-air kit in the fender? If so, does it have an elbow in front of the MAF? I had some problems in the past with a MAC cold-air kit that screwed-up the air distribution through the meter. If so, remove the elbow and attach the filter directly to the MAF and see if that helps. I have used the C&L meters with good success in the past, so I know they work.

coupe · 03-19-2006, 01:35 PM

Yea. I had the filter directly on the MAF to solve the idle-surge problems (up & down hunting until it dies). It idles great with filter on MAF, but terrible air-sampling for the MAF.
The MAC elbow has a longer straight-section of the pipe; I put thatpart in front of MAF. Working much better, but cold-idle is pathetic again.

LeeH · 03-19-2006, 10:44 PM

Have you tried reclocking the meter in an attempt to help the idle issues?

03-16-2006, 06:57 PM	#31
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	Re: Okay guys. What could it be? Have you tried throwing some octane boost in to see if it will go away

03-16-2006, 09:02 PM	#32
nxcoupe Senior Member Join Date: Dec 2005 Location: Somewhere, Afghanistan Posts: 122	Re: Okay guys. What could it be? I am certain the mass air is the culprit, causing the load calculations to be way off. I would say the cooler air is causing the computer to give more advance because of the IAT spark adder. It is doing it in closed loop too, so the mass air is my suspect. Try spinning the mass air in the intake ductwork, move it 30 degrees at a time in the same direction even though you have a conical filter. If the pinging goes away, you know you are getting better readings of the incoming air. Right now it is seeing less load, and giving less fuel and more spark accordingly. Good luck. Put that ProM on and see what happens. Also, check the fuel pressure with a different gauge, that happened on a customer's car once. __________________ Michael 92 coupe R/S 8

03-17-2006, 07:09 AM	#33
coupe Super Moderator Join Date: Dec 2004 Posts: 6,313	Re: Okay guys. What could it be? I think I fixed it. We'll see how it does as the day warms up, but it did much better this morning. __________________ " If you can't explain it simply, you don't understand it well enough. " - Albert Einstein

03-17-2006, 08:55 AM	#34
93Cobra#2771 The Kocky One Join Date: Dec 2004 Location: Yeah, but those cutters won't bust any walnuts.â„¢ Posts: 1,948	Re: Okay guys. What could it be? Don't just tease us, tell us what you did... __________________ *For Sale: Reproduction Window Stickers, 87+ Mustangs, Cobras, Lightnings, and HD F150!* Richard White 93 Cobra Kocky will be back!

03-17-2006, 11:49 AM	#35
coupe Super Moderator Join Date: Dec 2004 Posts: 6,313	Re: Okay guys. What could it be? N/M. Still doing it...not as bad. It's the MAF...trying something else before writing off the C&L. __________________ " If you can't explain it simply, you don't understand it well enough. " - Albert Einstein

03-17-2006, 03:51 PM	#37
snakebit95 Junior Member Join Date: Feb 2006 Location: Montgomery, AL Posts: 21	Re: Okay guys. What could it be? Oh, something else to add.......are you running a cold-air kit in the fender? If so, does it have an elbow in front of the MAF? I had some problems in the past with a MAC cold-air kit that screwed-up the air distribution through the meter. If so, remove the elbow and attach the filter directly to the MAF and see if that helps. I have used the C&L meters with good success in the past, so I know they work. __________________ 1995 Cobra - Naturally Aspirated 347 that pisses my BEEOTCH neighbor off regularly

03-19-2006, 01:35 PM	#38
coupe Super Moderator Join Date: Dec 2004 Posts: 6,313	Re: Okay guys. What could it be? Yea. I had the filter directly on the MAF to solve the idle-surge problems (up & down hunting until it dies). It idles great with filter on MAF, but terrible air-sampling for the MAF. The MAC elbow has a longer straight-section of the pipe; I put thatpart in front of MAF. Working much better, but cold-idle is pathetic again. __________________ " If you can't explain it simply, you don't understand it well enough. " - Albert Einstein

03-19-2006, 10:44 PM	#39
LeeH Senior Member Join Date: Dec 2005 Location: The conservative underground Posts: 341	Re: Okay guys. What could it be? Have you tried reclocking the meter in an attempt to help the idle issues? __________________ 89LX Hatch 89LX Coupe 89GT 90GT 93GT