Stock timing, 93 octane and I still get detonation????HELP!

StangDan · 06-28-2001, 08:43 PM

I have a serious problem. My timing was never altered from stock, a 72 year old woman owned my car so I know it wasn't touched. My problem is when under moderate acceleration at about 3000 RPM's I get a pinging from the engine, NO MATTER WHAT OCTANE I use. I have a stock 5.0 with A MAC cat-back and MSD 6AL, that's all, it pings with or without the MSD connected. Plugs are gapped at.045. The only thing that I can think of is that I switched over my car from a AOD to a T-5 and I left the stock computer in the car. My car has 80,000 miles on it, 68,000 of which were pampered by the old lady, too bad I can't say the same for the other 12,000, but that is STILL no reason for the Detonation,. Please Help I am going nuts!!!! Thank

Stang Runner · 06-28-2001, 09:39 PM

You need to check the timming!!!!!!! Dont drive it and mess it all up (your Car)It could be you need a timing chain.

------------------
1988 LX 5.0 3060lbs (full Tank) 14.90@100.2 On a Gtech
Drivetrain: 2.73 Stock Gears (New Gears Are in my house3.55), World Class T-5, Lakewood Bellhousing, Summit Adjustable Cluch Quadrant & Cable, Alumminum Driveshaft, Flaming River Manual Steering Rack
Suspension: MAC Control Arms,Maximum Motorsports Front Grip Package, H&R Sport Spings, Bilstein Shocks
Engine: Steal Mounts, Ram air, K&N, Under Drive Pulles
Exhaust: 1 5/8 Un-Equal Length Mac Headers, X-pipe W\cats, Edelbrock cat\

[This message has been edited by Stang Runner (edited 06-28-2001).]

jimberg · 06-28-2001, 10:13 PM

Yes, check your timing. Do you know if she had grand kids that she let use the car? Could she have duped you like Barney Fife?

What year is your car, BTW? Is it by any chance a 95? Probably not. It would take an old lady years to put on 68k.

Shouldn't your plugs be gapped at .052-.053? I think there is a difference between AOD and T5 computers as far as timing curves go, so you may want to get a computer out of a T5 equiped stang.

------------------
351W 89 Mustang GT Convertible

Francismaximus · 06-29-2001, 12:14 AM

Probably carbon build up go that route to fix it,

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StreetStang37 · 06-29-2001, 04:58 AM

What kind of plugs are in it right now? I thought the computers would be the same. I thought I read somewhere in one of the Muscle Mustangs and Fast Fords where they did a swap from an SN95 AOD-E to T-5 and I think they just left the harness there because the computer only sends info, doesn't recieve any from the tranny. This is gonna bug me now, I'll have to look for that magazine now ****** !!

------------------
1993 Mustang GT - March Ram Air & Pullies, K&N, C&L 73mm MAF, 3.73 Gears, Super Competition Hooker Headers, 2 1/2 in. High Flow H-Pipe & Cat Back, Pro 5.0 Shifter, 16* Timing Advance, 8.5mm MSD Super Cunductor Plug Wires, Romoved front Sway Bar, Pro-Shift Lite, LX lights

jimberg · 06-29-2001, 08:23 AM

I'm not certain about there being a difference. Whether or not the tranny sends info to the computer, the computer can still be programmed in such a way to compensate for the AOD.

------------------
351W 89 Mustang GT Convertible

exgmguy · 06-29-2001, 03:42 PM

Your computer is fine with what you have.

If it is pinging at part throttle around 3000 rpm, and maybe not at WOT, I would look into replacing the EGR valve. That is probably your culprit.

------------------
1988 Mustang GT
12.0 @ 122
1992 BadAzz Wrangler
1993 Explorer

StangDan · 06-30-2001, 12:27 PM

exgmguy, Not only does it ping under part throttle but it also pings if I shift gears hard. Still think it's the EGR? Jimberg, my car is a 93.

andy669 · 06-30-2001, 02:45 PM

On the SN95's the ecu's are different, but an AODE computer will work with a T-5. I've never done a conversion on a 87-93, but I was always told that the computers would NOT interchange. Hell, call up one of the big salvage yards that sells complete conversion kits. I talked to Daves Mustang parts a couple of times, and even though I didnt buy anything from them, they were still friendly and helpful.

06-28-2001, 08:43 PM	#1
StangDan Registered Member Join Date: Mar 2001 Location: Lincoln/RI/USA Posts: 22	Stock timing, 93 octane and I still get detonation????HELP! I have a serious problem. My timing was never altered from stock, a 72 year old woman owned my car so I know it wasn't touched. My problem is when under moderate acceleration at about 3000 RPM's I get a pinging from the engine, NO MATTER WHAT OCTANE I use. I have a stock 5.0 with A MAC cat-back and MSD 6AL, that's all, it pings with or without the MSD connected. Plugs are gapped at.045. The only thing that I can think of is that I switched over my car from a AOD to a T-5 and I left the stock computer in the car. My car has 80,000 miles on it, 68,000 of which were pampered by the old lady, too bad I can't say the same for the other 12,000, but that is STILL no reason for the Detonation,. Please Help I am going nuts!!!! Thank

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06-28-2001, 09:39 PM	#2
Stang Runner Registered Member Join Date: Jun 1999 Location: Walker, MI, USA Posts: 1,202	You need to check the timming!!!!!!! Dont drive it and mess it all up (your Car)It could be you need a timing chain. ------------------ 1988 LX 5.0 3060lbs (full Tank) 14.90@100.2 On a Gtech Drivetrain: 2.73 Stock Gears (New Gears Are in my house3.55), World Class T-5, Lakewood Bellhousing, Summit Adjustable Cluch Quadrant & Cable, Alumminum Driveshaft, Flaming River Manual Steering Rack Suspension: MAC Control Arms,Maximum Motorsports Front Grip Package, H&R Sport Spings, Bilstein Shocks Engine: Steal Mounts, Ram air, K&N, Under Drive Pulles Exhaust: 1 5/8 Un-Equal Length Mac Headers, X-pipe W\cats, Edelbrock cat\ [This message has been edited by Stang Runner (edited 06-28-2001).]

06-28-2001, 10:13 PM	#3
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	Yes, check your timing. Do you know if she had grand kids that she let use the car? Could she have duped you like Barney Fife? What year is your car, BTW? Is it by any chance a 95? Probably not. It would take an old lady years to put on 68k. Shouldn't your plugs be gapped at .052-.053? I think there is a difference between AOD and T5 computers as far as timing curves go, so you may want to get a computer out of a T5 equiped stang. ------------------ 351W 89 Mustang GT Convertible

06-29-2001, 12:14 AM	#4
Francismaximus Registered Member Join Date: May 2001 Location: Harriman, NY, USA Posts: 11	Probably carbon build up go that route to fix it, ------------------

06-29-2001, 04:58 AM	#5
StreetStang37 Registered Member Join Date: Dec 2000 Location: San Jose, California USA Posts: 275	What kind of plugs are in it right now? I thought the computers would be the same. I thought I read somewhere in one of the Muscle Mustangs and Fast Fords where they did a swap from an SN95 AOD-E to T-5 and I think they just left the harness there because the computer only sends info, doesn't recieve any from the tranny. This is gonna bug me now, I'll have to look for that magazine now ****** !! ------------------ 1993 Mustang GT - March Ram Air & Pullies, K&N, C&L 73mm MAF, 3.73 Gears, Super Competition Hooker Headers, 2 1/2 in. High Flow H-Pipe & Cat Back, Pro 5.0 Shifter, 16* Timing Advance, 8.5mm MSD Super Cunductor Plug Wires, Romoved front Sway Bar, Pro-Shift Lite, LX lights

06-29-2001, 08:23 AM	#6
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	I'm not certain about there being a difference. Whether or not the tranny sends info to the computer, the computer can still be programmed in such a way to compensate for the AOD. ------------------ 351W 89 Mustang GT Convertible

06-29-2001, 03:42 PM	#7
exgmguy Registered Member Join Date: Feb 1999 Location: Utica, Michigan Posts: 2,631	Your computer is fine with what you have. If it is pinging at part throttle around 3000 rpm, and maybe not at WOT, I would look into replacing the EGR valve. That is probably your culprit. ------------------ 1988 Mustang GT 12.0 @ 122 1992 BadAzz Wrangler 1993 Explorer

06-30-2001, 12:27 PM	#8
StangDan Registered Member Join Date: Mar 2001 Location: Lincoln/RI/USA Posts: 22	exgmguy, Not only does it ping under part throttle but it also pings if I shift gears hard. Still think it's the EGR? Jimberg, my car is a 93.

06-30-2001, 02:45 PM	#9
andy669 Registered Member Join Date: Jan 2001 Location: Moline Il Posts: 901	On the SN95's the ecu's are different, but an AODE computer will work with a T-5. I've never done a conversion on a 87-93, but I was always told that the computers would NOT interchange. Hell, call up one of the big salvage yards that sells complete conversion kits. I talked to Daves Mustang parts a couple of times, and even though I didnt buy anything from them, they were still friendly and helpful.