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Posted by 50kingz (Member # 11006) on :
 
1992 mustang 5.0 aod misfires/backfire wen underload about 3000 rpm.new adjustable holley reg. Clean mass air sensor, tps is good. Swithed out distributor. New plug.. I checked for codes i get code 15. 34. 85

If anybody knows wat could be wrong plz lmk
 
Posted by 93lx4cyl (Member # 10517) on :
 
Possibly faulty spark plug wire (s) ? Had that happen before.
 
Posted by Tom Renzo (Member # 13165) on :
 
The codes are as follows

15 Battery recently disconnected
34 EGR not seating
85 CANP solenoid disconnected.>> Canister Purge Solenoid (5.0L/V8-302): Lower RH Side Of Engine Compartment

Wires and plugs is a GIVEN!! Change them!!

[ 2013-09-18, 06:30 PM: Message edited by: Tom Renzo ]
 
Posted by 50kingz (Member # 11006) on :
 
Brandnew wires 10mm taylors. New spark plugs autolite 3924 gap at 32
 
Posted by 50kingz (Member # 11006) on :
 
Check timing its at 8degs fuel pressure at 40psi with vac line off
 
Posted by Marks93 (Member # 11130) on :
 
What heads are you running? Any bolt-ons? What type of distributor?

[ 2013-09-19, 02:28 PM: Message edited by: Marks93 ]
 
Posted by 50kingz (Member # 11006) on :
 
H/c/i tfs heads. 42lb inj with 76mm mass air calibratedfor 42s. Stock distributor
 
Posted by Marks93 (Member # 11130) on :
 
That explains the Autolite 3294's. Not sure of the gap .035. That's different than mine which were recommended to be gapped at .042 with AFR heads.

Also, are the injectors/maf too big for your setup? I haven't heard of 42lb injectors with just H/C/I. Are you supercharged as well?
I'm not sure what having injectors that big will do to it. I'm just learning all this stuff....

[ 2013-09-19, 10:08 PM: Message edited by: Marks93 ]
 
Posted by 50kingz (Member # 11006) on :
 
Ya i have vortech v2.. is there a differene between t5 and aod o2 harness?
 
Posted by Marks93 (Member # 11130) on :
 
I don't know much about AOD's. I've always had a T5. Someone else can probably answer that one.
 
Posted by 79 cobra (Member # 10137) on :
 
I think the 02 harness is different from aod to t-5

[ 2013-09-20, 07:32 AM: Message edited by: 79 cobra ]
 
Posted by Stang66 (Member # 10504) on :
 
quote:
Originally posted by 79 cobra:
I think the 02 harness is different from aod to t-5
Definitely and some things can get fried in the ECU if I remember correctly contact MUSTANGGUY he's a pro with 5.0 electrical
 
Posted by Tom Renzo (Member # 13165) on :
 
quote:
Originally posted by 50kingz:
H/c/i tfs heads. 42lb inj with 76mm mass air calibratedfor 42s. Stock distributor
WOW way to big on your injectors. With a 24 LB injector at 40 PSI @ 80% You can support 300 HP. I highly doubt you are making that kind of POWER. My ROUSCH 347 puts down 320 @ The wheels and i am running #24 LB Injectors. 42Lb injectors are way to big. Unless you have some kind of monster motor 42 LB injectors can support 450+ HP
h!!!

[ 2013-09-20, 04:42 PM: Message edited by: Tom Renzo ]
 
Posted by 50kingz (Member # 11006) on :
 
Car was tuned at aed it put down 465hp 463torque with 10lb boost..
 
Posted by Tom Renzo (Member # 13165) on :
 
That explains it. I did not know the build. I figured it had to be modified to the HILT to run those injectors. So what does AED say about the performance issue?? Did you have them look at the issue. Just curious? That is what i posted. 42 pound injectors is what i would use as well. Like i posted 450+ thanks for clearing that up. OK so sounds like spark blow out or something with ignition. Hard to figure unless i had the car in person. Driving a car to diagnose it and rolling it on my dyne would help with an issue like this. Only problem we are 3000 miles away. Your plugs are gaped correctly for that boost so i would rule that out. And your wires are new . But did you check them?? Also you should pull the plugs to check them. One may have an issue. Good luck

Here is a plug that i found on my own car. I had a miss fire @ high RPM.It turned out to be a bad plug. It happens some time. You have to dig in on an issue like you are having

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[ 2013-09-20, 07:41 PM: Message edited by: Tom Renzo ]
 




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