not a mustang but same concept, runs like crap!

jerrys84 · 04-01-2002, 11:43 PM

had a guy swap motors from a 85 bronco to a 86 P.U. Both had 302 EFI's. The P.U. had a bad motor.

He comleted the swap and called me. i took the truck home tonite. it seemed to run good untill it warmed up (5 miles down the road), then it lost alot of power (top speed 65 mph).. while driving at 50, it keeps kicking out of top gear when you let off the gas. Also, any short test drive (of a mile or two) and the exhaust manifold's get so hot they get red...

Both vehicles ran good prior to the engine swap (other than bad main bearing in the truck motor).

I really need to drive this truck until the weather improves...

HELP PLEEZ!!!

Unit 5302 · 04-02-2002, 12:56 AM

You're running SUPER lean or you have some major timing issues. What kind of injection systems are you working with? CFI, SEFI?

PKRWUD · 04-02-2002, 01:16 AM

Did he swap the ECM too?

jerrys84 · 04-02-2002, 01:09 PM

I don't think he swapped the ECM..

CFI or SEFI?? I don't understand...

My head hurts...

PKRWUD · 04-02-2002, 01:58 PM

The truck had an MFI (Multi-point Fuel Injection) system. The Bronco may have had a CFI (Central Fuel Injection) system. Did both intakes look the same? Either way, the ECM needs to be swapped.

Take care,
-Chris

jerrys84 · 04-02-2002, 04:01 PM

yes, the intakes looked the same...

I'll ask him if he changed it...

Thanx for the help..

jerrys84 · 04-02-2002, 04:52 PM

just thinking about this problem,

could'nt it be a vacuum leak somewhere????

Redline302 · 04-02-2002, 06:03 PM

dose it still have the cats ????

jerrys84 · 04-02-2002, 10:42 PM

Yes, both cats.. You thinking plugged??

Just sprayed carb cleaner all over the motor looking for a vacuum leak, no change in RPM's, so I am guessing no leaks...

Do fords have a vacuum line going to their auto trans????

Then again, I 'paid' this guy to swap motors, why am i even messing with it???

To answer myself, I'm a glutton for punishment??

Chris

where would the ECM be??

PKRWUD · 04-03-2002, 07:09 AM

Quote:

Originally posted by jerrys84
Chris

where would the ECM be??

Should be behind the drivers side kick panel.

Take care,
-Chris

gtsr515 · 04-03-2002, 05:08 PM

Sounds like you need to swap the computer. Also, maybe you skipped a tooth on the distributor swap.

Redline302 · 04-03-2002, 07:02 PM

if it pluged the exhaust wont breath just put your hand over the tail pipe to see if theres any pressure

Unit 5302 · 04-03-2002, 08:28 PM

I have a hard time understanding how you could even hook up a CFI engine to an SEFI harness. As far as the cats being clogged, it wouldn't have run great for 5min. Sounds to me like it might be an emissions system deal too.

Good luck with the computer.

Redline302 · 04-03-2002, 11:16 PM

Just a thought when I had my firebird I made it probably 20 miles before it shut down and with out the exhaust breathing it turned my pipes cherry red, and then it slowed to a idle for a few then died....

RageForces · 04-03-2002, 11:30 PM

When I put my 302 back togather i skept one tooth on the disturber gear . I got a false timing on the car . It would run ok for a little while then the headers would get cherry red. Then the car would stop running. Sorry about the spelling.

04-01-2002, 11:43 PM	#1
jerrys84 Registered Member Join Date: Feb 2002 Location: minnesota Posts: 129	not a mustang but same concept, runs like crap! had a guy swap motors from a 85 bronco to a 86 P.U. Both had 302 EFI's. The P.U. had a bad motor. He comleted the swap and called me. i took the truck home tonite. it seemed to run good untill it warmed up (5 miles down the road), then it lost alot of power (top speed 65 mph).. while driving at 50, it keeps kicking out of top gear when you let off the gas. Also, any short test drive (of a mile or two) and the exhaust manifold's get so hot they get red... Both vehicles ran good prior to the engine swap (other than bad main bearing in the truck motor). I really need to drive this truck until the weather improves... HELP PLEEZ!!! __________________ 91 LX 'work in progress' previous stangs; lightly modded 84GT 81 2.3 converted to 302 auto

04-02-2002, 01:16 AM	#3
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Did he swap the ECM too? __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

04-02-2002, 01:09 PM	#4
jerrys84 Registered Member Join Date: Feb 2002 Location: minnesota Posts: 129	I don't think he swapped the ECM.. CFI or SEFI?? I don't understand... My head hurts... __________________ 91 LX 'work in progress' previous stangs; lightly modded 84GT 81 2.3 converted to 302 auto

04-02-2002, 01:58 PM	#5
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	The truck had an MFI (Multi-point Fuel Injection) system. The Bronco may have had a CFI (Central Fuel Injection) system. Did both intakes look the same? Either way, the ECM needs to be swapped. Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

04-02-2002, 04:01 PM	#6
jerrys84 Registered Member Join Date: Feb 2002 Location: minnesota Posts: 129	yes, the intakes looked the same... I'll ask him if he changed it... Thanx for the help.. __________________ 91 LX 'work in progress' previous stangs; lightly modded 84GT 81 2.3 converted to 302 auto

04-02-2002, 12:56 AM	#2
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	You're running SUPER lean or you have some major timing issues. What kind of injection systems are you working with? CFI, SEFI?

04-02-2002, 04:52 PM	#7
jerrys84 Registered Member Join Date: Feb 2002 Location: minnesota Posts: 129	just thinking about this problem, could'nt it be a vacuum leak somewhere???? __________________ 91 LX 'work in progress' previous stangs; lightly modded 84GT 81 2.3 converted to 302 auto

04-02-2002, 06:03 PM	#8
Redline302 Registered Member Join Date: Mar 2002 Location: Michigan Posts: 31	dose it still have the cats ???? __________________ 84 Mustang GT 350 20th Anniversary Limited Edition MyCar

04-02-2002, 10:42 PM	#9
jerrys84 Registered Member Join Date: Feb 2002 Location: minnesota Posts: 129	Yes, both cats.. You thinking plugged?? Just sprayed carb cleaner all over the motor looking for a vacuum leak, no change in RPM's, so I am guessing no leaks... Do fords have a vacuum line going to their auto trans???? Then again, I 'paid' this guy to swap motors, why am i even messing with it??? To answer myself, I'm a glutton for punishment?? Chris where would the ECM be?? __________________ 91 LX 'work in progress' previous stangs; lightly modded 84GT 81 2.3 converted to 302 auto

04-03-2002, 05:08 PM	#11
gtsr515 Registered Member Join Date: Nov 2001 Location: Sunny, Hot, Sebring, Florida Posts: 725	Sounds like you need to swap the computer. Also, maybe you skipped a tooth on the distributor swap. __________________ Remember...2nd place is 1st place for losers!

04-03-2002, 07:02 PM	#12
Redline302 Registered Member Join Date: Mar 2002 Location: Michigan Posts: 31	if it pluged the exhaust wont breath just put your hand over the tail pipe to see if theres any pressure __________________ 84 Mustang GT 350 20th Anniversary Limited Edition MyCar

04-03-2002, 08:28 PM	#13
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	I have a hard time understanding how you could even hook up a CFI engine to an SEFI harness. As far as the cats being clogged, it wouldn't have run great for 5min. Sounds to me like it might be an emissions system deal too. Good luck with the computer.

04-03-2002, 11:16 PM	#14
Redline302 Registered Member Join Date: Mar 2002 Location: Michigan Posts: 31	Just a thought when I had my firebird I made it probably 20 miles before it shut down and with out the exhaust breathing it turned my pipes cherry red, and then it slowed to a idle for a few then died.... __________________ 84 Mustang GT 350 20th Anniversary Limited Edition MyCar

04-03-2002, 11:30 PM	#15
RageForces Registered Member Join Date: Mar 2002 Location: S.C Posts: 28	When I put my 302 back togather i skept one tooth on the disturber gear . I got a false timing on the car . It would run ok for a little while then the headers would get cherry red. Then the car would stop running. Sorry about the spelling.

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