Missing under load, raw gas smell at idle, COP issue?

Woodman · February 3rd, 2012, 09:32 AM

1999 Mustang GT, CAI going into fenderwell, no other engine mods.

So it's been warm up here in Minnesota, so I pulled the Mustang out last weekend and took it for a drive on Sunday. Started missing mid drive, no CEL, but I did notice a smell of raw gas. Car has 115K on the clock, Probably still on original plugs, and it has a mix and match set of coils, 5 OEM, 2 Accel, 1 MSD.

I'm going to go ahead and clean the MAF (any reccomendations as what to use? I have electronic contact cleaner here at work, or if there is a specific product I'll get some), pull and change the plugs (if needed, and I will check the gap as well), and I'm wondering if my SCT will tell me what is misfiring without a CEL, or should I go ahead and just replace all 8 since it's not too bad. If I replace all 8, do I go with the Accel set on AM's site, or do I go to Rock Auto and get one of their brand. I noticed no Motorcraft brand on Rock Auto.

Any other possibilities? I'll check to make sure there's no water in the plug wells too.

Thanks in advance.

Supercharged02GT · February 3rd, 2012, 09:36 AM

I run jegs brand cops on my car they are great and cheap, but I have only ran them for about 5000 miles, most will say if you have the money buy the motorcraft cops they are suppose to be the most reliable, as far as the Maf it sounds like the cleaner you have should do fine, and I would recommend NGK plug for the car and just get the coppers!

2vStangGt · February 3rd, 2012, 09:39 AM

My car was missin and I changed all 8 coils and problem fixed? GL

Woodman · February 3rd, 2012, 09:43 AM

Originally Posted by Supercharged02GT

I run jegs brand cops on my car they are great and cheap, but I have only ran them for about 5000 miles, most will say if you have the money buy the motorcraft cops they are suppose to be the most reliable, as far as the Maf it sounds like the cleaner you have should do fine, and I would recommend NGK plug for the car and just get the coppers!

I hear good things about NGK as well, but I also hear good things about the stock Motocraft ones too. I'll price them up and listen to other opinions. I'll also check out the JEGS coils.

Thanks.

Woodman · February 20th, 2012, 04:54 PM

Found the problem... The previous owner put a coil back in that had no boot. No idea how it ran so long without it, but she's running on all 8 now.

Is it normal for the stock PI intake to slightly shroud the spark plug well on the second to last plug on the passenger side? Thought that was odd.

02GreyGhost · February 21st, 2012, 09:37 AM

Originally Posted by Woodman

Found the problem... The previous owner put a coil back in that had no boot. No idea how it ran so long without it, but she's running on all 8 now.

Is it normal for the stock PI intake to slightly shroud the spark plug well on the second to last plug on the passenger side? Thought that was odd.

Yes I believe it is normal. If you can post a pic maybe. I dont know if the 99 intakes were alittle different than the 2002's I believe they are slightly different in some areas other than the cross member where the thermostat sits.

Woodman · February 21st, 2012, 02:15 PM

Originally Posted by 02GreyGhost

Yes I believe it is normal. If you can post a pic maybe. I dont know if the 99 intakes were alittle different than the 2002's I believe they are slightly different in some areas other than the cross member where the thermostat sits.

I was getting cold at that point, so I put changing that plug for another day. All the rest of the plugs were in great shape, just had mileage on them, so I figured leaving it in for a test run wouldn't hurt anything. Not quite sure there's enough room for a standard spark plug socket in there, but I'll see if I can get a pic when I'm working on it next.

cliffyk · February 21st, 2012, 06:25 PM

If they are original plugs they should have been changed 15k miles ago...

cschoening09 · February 21st, 2012, 11:41 PM

cliffyk, i really like your interior lol

02GreyGhost · February 22nd, 2012, 10:31 AM

Originally Posted by cschoening09

cliffyk, i really like your interior lol

^^^ +1

February 3rd, 2012, 09:32 AM	#1
Woodman Regular 1999 Mustang GT Join Date: Nov 2011 Location: Duluth, MN Posts: 309 iTrader: 0 reviews	Missing under load, raw gas smell at idle, COP issue? 1999 Mustang GT, CAI going into fenderwell, no other engine mods. So it's been warm up here in Minnesota, so I pulled the Mustang out last weekend and took it for a drive on Sunday. Started missing mid drive, no CEL, but I did notice a smell of raw gas. Car has 115K on the clock, Probably still on original plugs, and it has a mix and match set of coils, 5 OEM, 2 Accel, 1 MSD. I'm going to go ahead and clean the MAF (any reccomendations as what to use? I have electronic contact cleaner here at work, or if there is a specific product I'll get some), pull and change the plugs (if needed, and I will check the gap as well), and I'm wondering if my SCT will tell me what is misfiring without a CEL, or should I go ahead and just replace all 8 since it's not too bad. If I replace all 8, do I go with the Accel set on AM's site, or do I go to Rock Auto and get one of their brand. I noticed no Motorcraft brand on Rock Auto. Any other possibilities? I'll check to make sure there's no water in the plug wells too. Thanks in advance.

February 3rd, 2012, 09:36 AM	#2
Supercharged02GT Regular 2002 Mustang GT N/a Join Date: Jan 2012 Location: Central ohio Posts: 71 iTrader: 0 reviews	I run jegs brand cops on my car they are great and cheap, but I have only ran them for about 5000 miles, most will say if you have the money buy the motorcraft cops they are suppose to be the most reliable, as far as the Maf it sounds like the cleaner you have should do fine, and I would recommend NGK plug for the car and just get the coppers! __________________ Your car must be fast because I was hauling ass when I passed you in my Mustang!

February 21st, 2012, 06:25 PM	#8
cliffyk Hardcore Enthusiast Join Date: Feb 2007 Location: Saint Augustine, FL Posts: 1,808 iTrader: 1 reviews	If they are original plugs they should have been changed 15k miles ago... __________________ -cliff knight- My Mustang 2003 GT, UPR X, 24lb/h injectors, Magnaflow, 180° stat, PP 70mm TB & plenum, DF Commando, Steeda UDPs, Ralco RZ_flywheel, RAM HDX clutch, WX EFX COPs 3.73s, 262 rwHP/305 lb-ft. Flex-fuel: burns gas and rubber...

February 21st, 2012, 11:41 PM	#9
cschoening09 Hardcore Enthusiast 2001 Mustang GT 9.30 @ 77mph-1/8th mile 2.2 60' Join Date: Oct 2010 Location: Council Bluffs, IA Posts: 1,705 iTrader: 3 reviews	cliffyk, i really like your interior lol __________________ 01 GT. 5spd , 03-04 cobra clutch, on its 2nd 4.6l motor2nd tr3650 too,JLT CAI,UPR o/r x, magnapack catback, predator tuned, H&R ss 10.5" bullitts w/ nt555r DR's

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Thread vs commodore missing under load \| Just Commodores - Holden Commodore Discussion Forum \| BoardReader	This thread	Refback	March 31st, 2012 03:56 PM

February 3rd, 2012, 09:39 AM	#3
2vStangGt Enthusiast 01 Mustang Gt Join Date: Jan 2012 Location: Kansas City MO Posts: 568 iTrader: 1 reviews	My car was missin and I changed all 8 coils and problem fixed? GL

February 20th, 2012, 04:54 PM	#5
Woodman Regular 1999 Mustang GT Join Date: Nov 2011 Location: Duluth, MN Posts: 309 iTrader: 0 reviews	Found the problem... The previous owner put a coil back in that had no boot. No idea how it ran so long without it, but she's running on all 8 now. Is it normal for the stock PI intake to slightly shroud the spark plug well on the second to last plug on the passenger side? Thought that was odd.

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