Need help with 94 GT

87coupe331 · August 1st, 2011, 08:13 PM

I just put a 90 GT motor in a 94 GT and I can not get any power out of it, the 94 motor had the same problem,
it will not even get out of its own way and is worse when it warms up. PLEASE HELP !!!
My wife wants to drive her car and she is making me crazy.
Any help would be very helpful. THANKS

Bubba95SN · August 1st, 2011, 10:55 PM

Plugged exhaust.

91sleeper · August 1st, 2011, 11:16 PM

whats your fuel pressure?

Daves94vert · August 1st, 2011, 11:24 PM

Did you reuse the sensors? Maybe your coolant temp sensor?

hotmustang95 · August 2nd, 2011, 02:22 PM

So it starts up fine and idles fine but it just wont move? Does it drive ok until it warms up? If the 94 engine did the same thing then I think it's not the motor doing it. Need more info. Maybe your brakes are locked. Maybe the rear end is too.

01Sportchic · August 2nd, 2011, 02:28 PM

What Vic said, or maybe even something electrical.

Bullitt95 · August 2nd, 2011, 03:47 PM

Originally Posted by Bubba95SN

Plugged exhaust.

Yeah I was also going to say plugged up cats. You could also try cleaning the MAF sensor element.

87coupe331 · August 2nd, 2011, 06:38 PM

The cats have been gutted, fuel pressure is 38-40lbs, coolant temp sensors are new, and the rearend and the brakes are not locked up, also MAF sensor has been cleaned.
starts good idles low about 500-600 in park, when it warms up it runs worse.

hotmustang95 · August 2nd, 2011, 09:18 PM

Off topic, is that your engine in your avatar?

Back on topic your engine should be around 900 rpm at idle. By any chance did you break one of the tiny wires at the end of the MAF? Check your plug wire also. They could be arcing off onto the headers or any other metal if their old and cracked. This would make the car only run on the cylinders that aren't touching and act erratic.

91sleeper · August 2nd, 2011, 09:21 PM

unplug maf and drive it the car will not idle but if it is the maf it will run like a champ.

87coupe331 · August 2nd, 2011, 09:26 PM

avatar motor is in 87 but slightly changed.
MAF wires look good, not broken and plug wires are new and on all the way.
just check out earlier. just puzzled.

87coupe331 · August 2nd, 2011, 09:28 PM

unpluged MAF about a month ago and did not change

87coupe331 · August 2nd, 2011, 09:32 PM

also have problems with motor in the 87, have to set the timming at about 40 deg
to run pretty good

NFChaos2003 · August 3rd, 2011, 02:43 AM

Sounds like a problem I had with my old Camaro where, it would start up, idle, and then gas and it would just sputter and die. Turned out to be the distributor, give it shot cause from what you've said it sounds pretty similar.

87coupe331 · August 3rd, 2011, 08:56 PM

one thing that I forgot is that when I take out the spout to time it, the timming mark is still fluxuating a few deg on either side of the pointer

Bullitt95 · August 4th, 2011, 11:26 AM

Interesting. Sounds like the outer ring of the harmonic balancer is slipping on the inner ring. Check the balancer and see if there's any rubber protruding out between the two rings. You might need to replace the balancer to get the timing right.

95project · August 4th, 2011, 12:54 PM

Did u use the 94 ECU on your new motor?

95opal · August 4th, 2011, 04:00 PM

Originally Posted by 87coupe331

one thing that I forgot is that when I take out the spout to time it, the timming mark is still fluxuating a few deg on either side of the pointer

Originally Posted by Bullitt95

Interesting. Sounds like the outer ring of the harmonic balancer is slipping on the inner ring. Check the balancer and see if there's any rubber protruding out between the two rings. You might need to replace the balancer to get the timing right.

With the spout out the timing should be locked with no fluxuation, if its fluxuating, then I would have to look into what Bullitt said.. possible bad balancer. When you pulled the plugs how do they look and what exactly are you setting the timing to?

87coupe331 · August 4th, 2011, 05:20 PM

I have a new balancer and the old one still looks good
it still has the 94 ECU in it
plugs look good, and trying to set timming at 10-14 deg but does not work out.

87coupe331 · August 11th, 2011, 06:55 PM

Got that problem fixed with a new ignition system,
now just need to set the idle,
it idles at about 650-700 in park, way 2 low,
should be there in drive.

August 1st, 2011, 08:13 PM	#1
87coupe331 Newbie 1987 Mustang LX Coupe Join Date: Aug 2010 Location: Beaufort, MO Posts: 31 iTrader: 0 reviews	Need help with 94 GT I just put a 90 GT motor in a 94 GT and I can not get any power out of it, the 94 motor had the same problem, it will not even get out of its own way and is worse when it warms up. PLEASE HELP !!! My wife wants to drive her car and she is making me crazy. Any help would be very helpful. THANKS

August 2nd, 2011, 02:22 PM	#5
hotmustang95 Regular Last of the 302's Road Racing Rookie Join Date: Sep 2009 Location: Boynton Beach, FL Posts: 373 iTrader: 0 reviews	So it starts up fine and idles fine but it just wont move? Does it drive ok until it warms up? If the 94 engine did the same thing then I think it's not the motor doing it. Need more info. Maybe your brakes are locked. Maybe the rear end is too. __________________ Victor ( goofyfeet) Oliver P.B.M.C. Member Track Addict

August 2nd, 2011, 02:28 PM	#6
01Sportchic Premium Member 1997 Mustang Cobra 11.87@115.97 Join Date: Dec 2010 Location: Lake Worth, FL Posts: 880 iTrader: 1 reviews	What Vic said, or maybe even something electrical. __________________ Danielle D. Perez Photography

August 2nd, 2011, 09:18 PM	#9
hotmustang95 Regular Last of the 302's Road Racing Rookie Join Date: Sep 2009 Location: Boynton Beach, FL Posts: 373 iTrader: 0 reviews	Off topic, is that your engine in your avatar? Back on topic your engine should be around 900 rpm at idle. By any chance did you break one of the tiny wires at the end of the MAF? Check your plug wire also. They could be arcing off onto the headers or any other metal if their old and cracked. This would make the car only run on the cylinders that aren't touching and act erratic. __________________ Victor ( goofyfeet) Oliver P.B.M.C. Member Track Addict

August 4th, 2011, 12:54 PM	#17
95project Enthusiast Join Date: Oct 2007 Location: Memphis TN Posts: 609 iTrader: 0 reviews	Did u use the 94 ECU on your new motor? __________________ 95 GT- AFR 185's, Comp CAM, Trick FLow TH upper and lower, 30lb injec, 76MM C&L kit, Full MSD, BBK Pulleys, 3:73, BBK Long Tubes, X Pipe, Magnaflow Cat back, Cobra front control arms, MM CC plates LCA's and Panhard bar, tuned by Adam @ Pops Racing.

August 1st, 2011, 10:55 PM	#2
Bubba95SN Regular 1995 Mustang GT Join Date: Feb 2011 Location: Jacksonville NC Posts: 211 iTrader: 0 reviews	Plugged exhaust.

August 1st, 2011, 11:24 PM	#4
Daves94vert Newbie Join Date: Dec 2010 Posts: 11 iTrader: 0 reviews	Did you reuse the sensors? Maybe your coolant temp sensor?

August 2nd, 2011, 06:38 PM	#8
87coupe331 Newbie 1987 Mustang LX Coupe Join Date: Aug 2010 Location: Beaufort, MO Posts: 31 iTrader: 0 reviews	The cats have been gutted, fuel pressure is 38-40lbs, coolant temp sensors are new, and the rearend and the brakes are not locked up, also MAF sensor has been cleaned. starts good idles low about 500-600 in park, when it warms up it runs worse.

August 2nd, 2011, 09:26 PM	#11
87coupe331 Newbie 1987 Mustang LX Coupe Join Date: Aug 2010 Location: Beaufort, MO Posts: 31 iTrader: 0 reviews	avatar motor is in 87 but slightly changed. MAF wires look good, not broken and plug wires are new and on all the way. just check out earlier. just puzzled.

August 2nd, 2011, 09:28 PM	#12
87coupe331 Newbie 1987 Mustang LX Coupe Join Date: Aug 2010 Location: Beaufort, MO Posts: 31 iTrader: 0 reviews	unpluged MAF about a month ago and did not change

August 2nd, 2011, 09:32 PM	#13
87coupe331 Newbie 1987 Mustang LX Coupe Join Date: Aug 2010 Location: Beaufort, MO Posts: 31 iTrader: 0 reviews	also have problems with motor in the 87, have to set the timming at about 40 deg to run pretty good

August 3rd, 2011, 02:43 AM	#14
NFChaos2003 Regular 1995 Mustang GT Convert. FAIL@PWR Join Date: Nov 2010 Location: Long Island Posts: 62 iTrader: 0 reviews	Sounds like a problem I had with my old Camaro where, it would start up, idle, and then gas and it would just sputter and die. Turned out to be the distributor, give it shot cause from what you've said it sounds pretty similar.

August 3rd, 2011, 08:56 PM	#15
87coupe331 Newbie 1987 Mustang LX Coupe Join Date: Aug 2010 Location: Beaufort, MO Posts: 31 iTrader: 0 reviews	one thing that I forgot is that when I take out the spout to time it, the timming mark is still fluxuating a few deg on either side of the pointer

August 4th, 2011, 11:26 AM	#16
Bullitt95 Hardcore Enthusiast 1995 Mustang GT auto 13.546 @ 105.32 Join Date: Apr 2007 Location: Al Ain, UAE Posts: 1,452 iTrader: 0 reviews	Interesting. Sounds like the outer ring of the harmonic balancer is slipping on the inner ring. Check the balancer and see if there's any rubber protruding out between the two rings. You might need to replace the balancer to get the timing right.

August 4th, 2011, 05:20 PM	#19
87coupe331 Newbie 1987 Mustang LX Coupe Join Date: Aug 2010 Location: Beaufort, MO Posts: 31 iTrader: 0 reviews	I have a new balancer and the old one still looks good it still has the 94 ECU in it plugs look good, and trying to set timming at 10-14 deg but does not work out.

August 11th, 2011, 06:55 PM	#20
87coupe331 Newbie 1987 Mustang LX Coupe Join Date: Aug 2010 Location: Beaufort, MO Posts: 31 iTrader: 0 reviews	Got that problem fixed with a new ignition system, now just need to set the idle, it idles at about 650-700 in park, way 2 low, should be there in drive.

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