'95 Cougar V8... detonation?

DanTheMan · February 6th, 2008, 05:38 AM

Alright guys, this car has a 4.6L V8 and AODE trans.. I stomped it on the way home from work and when it downshifted to 1st and the RPMs hit about 4500 i heard a sound like someone dropping 5 pennies in a coffee can.. Now it does have a bad MAF (Code reader said MAF Circuit malfuntion) and a vacuum leak (reader said EGR overflow) so could this have something to do with it?

I've only has the car since monday but I've stomped it before and no probs.. The odometer is stuck at 126982 so it's probably got 200k or more.. Any ideas? It almost sounded like a belt slapping something...

TurboLX · February 6th, 2008, 05:49 PM

i heard a sound like someone dropping 5 pennies in a coffee can

detonation

DanTheMan · February 6th, 2008, 05:50 PM

aw hell, hope i didnt hurt anything. what would cause that to happen to a bone stock car?

TurboLX · February 6th, 2008, 05:55 PM

depends, running cheap gas prolly

go premium

DanTheMan · February 6th, 2008, 06:04 PM

dahm.. running premium in a beat up old cougar

now i only heard this once, should i worry about it?

TurboLX · February 6th, 2008, 06:11 PM

if it happens again, go premium

96GTRagTop · February 6th, 2008, 06:14 PM

Originally Posted by DanTheMan

dahm.. running premium in a beat up old cougar

now i only heard this once, should i worry about it?

suck it up.......ur running a 3900lb v8 with most likely 200k on her. By a 4 cyl if ur worried about gas.

u might wanna try doing a tune up for shits and giggles too, clean the wires n coils, new plugs, air filter

DanTheMan · February 6th, 2008, 07:30 PM

Originally Posted by 96GTRagTop

suck it up.......ur running a 3900lb v8 with most likely 200k on her. By a 4 cyl if ur worried about gas.

u might wanna try doing a tune up for shits and giggles too, clean the wires n coils, new plugs, air filter

nah rags i'm not worried about gas money i'm just sayin it'd look kinda funny pumping premium into a rather unsexy car

I actually traded my little 4 cyl dodge shadow for this car.. 4cyl FTL!!!!

It's already had a tune up too but it does have a bad maf and a vac leak somewhere (i suppose.. got egr overflow on the reader)

fosted285 · February 14th, 2008, 09:47 PM

With a bad MAF, it is entirely possible the fuel air mixture is not actually what the computer thinks it is. My initial thought is that too much air for the given amount of fuel is entering the combustion chamber thereby creating a lean condition that would be more susceptible to detonation than with the proper a/f ratio. If the problem persists and upgrading to premium gasoline doesn't solve it, replace the MAF.

The other alternative is to do some data logging throughout the RPM range on a dyno with a wide band O2 sensor hooked up. That's probably the most expensive troubleshooting idea but the most accurate. Good luck and I hope you have no further problems.

DanTheMan · February 15th, 2008, 02:56 AM

Originally Posted by fosted285

With a bad MAF, it is entirely possible the fuel air mixture is not actually what the computer thinks it is. My initial thought is that too much air for the given amount of fuel is entering the combustion chamber thereby creating a lean condition that would be more susceptible to detonation than with the proper a/f ratio. If the problem persists and upgrading to premium gasoline doesn't solve it, replace the MAF.

The other alternative is to do some data logging throughout the RPM range on a dyno with a wide band O2 sensor hooked up. That's probably the most expensive troubleshooting idea but the most accurate. Good luck and I hope you have no further problems.

that's also what i thought

wow.. that's all i can say lol. thanks for the help.. I'm probably replacing the MAF once I replace the steering colomn. I don't think puttin a 300 dollar car with at least 127000 on a dyno would be a smart idea

96GTRagTop · February 15th, 2008, 03:12 AM

Originally Posted by DanTheMan

that's also what i thought

wow.. that's all i can say lol. thanks for the help.. I'm probably replacing the MAF once I replace the steering colomn. I don't think puttin a 300 dollar car with at least 127000 on a dyno would be a smart idea

u can data log with an xcal 2 n laptop, or x cal 3.

if u have a tuner for ur GT just unmarry it temporarily

fosted285 · February 15th, 2008, 03:14 AM

Wish I could find a $300 beater just to drive around. The sandstorms out here hurt my heart every time I have to drive in them. One day I'm sure I'll find such a good deal.

fosted285 · February 15th, 2008, 03:15 AM

very good idea 96GT. didn't even fathom unmarrying tuners.

96GTRagTop · February 15th, 2008, 03:18 AM

Originally Posted by fosted285

very good idea 96GT. didn't even fathom unmarrying tuners.

hook a brotha up with some rep point brotha

(yes i am a rep whore)

fosted285 · February 15th, 2008, 03:21 AM

you got it

DanTheMan · February 15th, 2008, 06:26 AM

well i'd love to unmarry a tuner, but I don't even have one to take to dinner yet

February 6th, 2008, 05:38 AM	#1
DanTheMan Hardcore Enthusiast 1991 Civic DX 16min@42mph Join Date: Oct 2007 Location: Norfolk, VA Posts: 1,197	'95 Cougar V8... detonation? Alright guys, this car has a 4.6L V8 and AODE trans.. I stomped it on the way home from work and when it downshifted to 1st and the RPMs hit about 4500 i heard a sound like someone dropping 5 pennies in a coffee can.. Now it does have a bad MAF (Code reader said MAF Circuit malfuntion) and a vacuum leak (reader said EGR overflow) so could this have something to do with it? I've only has the car since monday but I've stomped it before and no probs.. The odometer is stuck at 126982 so it's probably got 200k or more.. Any ideas? It almost sounded like a belt slapping something... __________________ click for my cardomain ^

February 6th, 2008, 05:50 PM	#3
DanTheMan Hardcore Enthusiast 1991 Civic DX 16min@42mph Join Date: Oct 2007 Location: Norfolk, VA Posts: 1,197	aw hell, hope i didnt hurt anything. what would cause that to happen to a bone stock car? __________________ click for my cardomain ^

February 6th, 2008, 06:04 PM	#5
DanTheMan Hardcore Enthusiast 1991 Civic DX 16min@42mph Join Date: Oct 2007 Location: Norfolk, VA Posts: 1,197	dahm.. running premium in a beat up old cougar now i only heard this once, should i worry about it? __________________ click for my cardomain ^

February 15th, 2008, 03:14 AM	#12
fosted285 Regular 2006 Mustang GT 11.85@116 Join Date: Jan 2008 Location: People's Communist Republic of California Posts: 101	Wish I could find a $300 beater just to drive around. The sandstorms out here hurt my heart every time I have to drive in them. One day I'm sure I'll find such a good deal. __________________ 2006 GT Tungsten Grey Paxton Novi 2200 Intercooled, Kenne Bell Boost-A-Pump, 39Lb Injectors, Single chamber Flowmasters, Hurst shifter, Custom tune, And more... Can't wait for the next project -Dan

February 15th, 2008, 03:15 AM	#13
fosted285 Regular 2006 Mustang GT 11.85@116 Join Date: Jan 2008 Location: People's Communist Republic of California Posts: 101	very good idea 96GT. didn't even fathom unmarrying tuners. __________________ 2006 GT Tungsten Grey Paxton Novi 2200 Intercooled, Kenne Bell Boost-A-Pump, 39Lb Injectors, Single chamber Flowmasters, Hurst shifter, Custom tune, And more... Can't wait for the next project -Dan

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February 6th, 2008, 05:55 PM	#4
TurboLX IT'S TURBO TIME 1990 Mustang LX Turbo 9.71@151.6 mph Join Date: Oct 2006 Location: NY Posts: 8,740	depends, running cheap gas prolly go premium

February 6th, 2008, 06:11 PM	#6
TurboLX IT'S TURBO TIME 1990 Mustang LX Turbo 9.71@151.6 mph Join Date: Oct 2006 Location: NY Posts: 8,740	if it happens again, go premium

February 14th, 2008, 09:47 PM	#9
fosted285 Regular 2006 Mustang GT 11.85@116 Join Date: Jan 2008 Location: People's Communist Republic of California Posts: 101	With a bad MAF, it is entirely possible the fuel air mixture is not actually what the computer thinks it is. My initial thought is that too much air for the given amount of fuel is entering the combustion chamber thereby creating a lean condition that would be more susceptible to detonation than with the proper a/f ratio. If the problem persists and upgrading to premium gasoline doesn't solve it, replace the MAF. The other alternative is to do some data logging throughout the RPM range on a dyno with a wide band O2 sensor hooked up. That's probably the most expensive troubleshooting idea but the most accurate. Good luck and I hope you have no further problems.

February 15th, 2008, 03:21 AM	#15
fosted285 Regular 2006 Mustang GT 11.85@116 Join Date: Jan 2008 Location: People's Communist Republic of California Posts: 101	you got it __________________ 2006 GT Tungsten Grey Paxton Novi 2200 Intercooled, Kenne Bell Boost-A-Pump, 39Lb Injectors, Single chamber Flowmasters, Hurst shifter, Custom tune, And more... Can't wait for the next project -Dan

February 15th, 2008, 06:26 AM	#16
DanTheMan Hardcore Enthusiast 1991 Civic DX 16min@42mph Join Date: Oct 2007 Location: Norfolk, VA Posts: 1,197	well i'd love to unmarry a tuner, but I don't even have one to take to dinner yet __________________ click for my cardomain ^

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