This is topic Please Help!! 5.0 in need of help engine problems in forum Tech Talk at Northern California Ford Owners  .


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Posted by sj 50's (Member # 11042) on :
 
i have a 92 mustang 5.0 HO i swap my engine from a 67 302 no HO engine the car is only running on four cyl i have tried just about everything i've replaced wire,plugs injection harness, computers, injectors, dist its still only running on four cyl
 
Posted by Tony Montana (Member # 8288) on :
 
Wrong section but have you checked the firing order. An orginal 302 has a different order then a 5.0 H0. Anyway post in tech section youll get more info.
 
Posted by sj 50's (Member # 11042) on :
 
ive tried both firing orders 302 and 351 and still no change
 
Posted by sj 50's (Member # 11042) on :
 
the car is only running on cyl 1,2,6,8..500 Dergrees in these cyl checked with heat gun

there is spark at every plug but no fuel in cyl 3,4,5,7 ???? 100 degrees or less in these cyl checked with heat gun

compression is good so is the fuel pressure isw good too

the mechanic checked both firing orders he said that the car is still runnig on 4 cyl
 
Posted by 89foxstang (Member # 5908) on :
 
have you checked leak down and compression? also my guess might be since the later model 5.0 was a sequential injection (meaning it fires the injectors right before the intake stroke) since the non ho motor has a diff firing order im guessing the camshafts are different which would possibly mean that the injector is firing at the wrong time and the cyl isnt getting fuel when it should. you might be able to make a couple jumpers to test this theory and switch the injectors to the non ho firing order.

Edit- just saw your reply i think the injectors arent in time with the firing order build some test leads to confirm

[ August 08, 2011, 03:38 PM: Message edited by: 89foxstang ]
 
Posted by sj 50's (Member # 11042) on :
 
ok here is the break down on the eng..
the eng came out my 67 mustang not stock engine
it has been bored and hone .30 over with a comp cam roller lifter and rockers supplied by comp as well. heads are 302 stock cast iron heads with a 5 angle valve job ported ferrea gt40 valves. i had the motor built for the 67 with carb but the car sat for 3 years with a brand new motor and i thought i might as well stick it in my 50.. so i changed out tob end and started it but it just didnt run right i thought it was the wieght of the fly wheel sine the motor was balanced with a 28oz so i removed the 50oz to a 28oz didnt change
 
Posted by sj 50's (Member # 11042) on :
 
i dropped the car off at the mechanics shop it has been there a week and a half he has changed the dist,cap,wires,ecu,injector wiring harness and injectors,plugs checked fuel pressure and mafjust about everything he narrowed it down to the fuel not being deliverd to cyl 3,4,5,7
 
Posted by 89foxstang (Member # 5908) on :
 
Still could be injector timing I would check that
 
Posted by sj 50's (Member # 11042) on :
 
how can i do that?
 
Posted by sydewayzLX50 (Member # 10217) on :
 
I would get a cpu, and engine harness from a non HO EFI car like a crown victoria or something that should work.
 
Posted by 89foxstang (Member # 5908) on :
 
I'd say easiest way I can think of is either redo the wiring to match the non ho motor , or swap the cam out to an ho cam, since the camshaft is going to be the determining factor in the firing order
 
Posted by sj 50's (Member # 11042) on :
 
alright well i guess i have to pull my car out the shop cuz the mechanic seems to have some other plans to keep my car do you know any shops that specialize in mustangs
 
Posted by sydewayzLX50 (Member # 10217) on :
 
quote:
Originally posted by 89foxstang:
I'd say easiest way I can think of is either redo the wiring to match the non ho motor , or swap the cam out to an ho cam, since the camshaft is going to be the determining factor in the firing order
isnt the crank different too? i cant remember rite now...
 
Posted by 89foxstang (Member # 5908) on :
 
I wouldn't think they would change the crank throws, but to tell you the truth I don't know for sure!
 
Posted by wilit (Member # 3367) on :
 
quote:
Originally posted by sydewayzLX50:
quote:
Originally posted by 89foxstang:
I'd say easiest way I can think of is either redo the wiring to match the non ho motor , or swap the cam out to an ho cam, since the camshaft is going to be the determining factor in the firing order
isnt the crank different too? i cant remember rite now...
Other than the imbalance, the cranks are the same.

You need to figure out what cam you have. Once you know that, it'll make troubleshooting easier.

[ August 09, 2011, 12:54 AM: Message edited by: wilit ]
 
Posted by sj 50's (Member # 11042) on :
 
well i think i need to pull my car out the shop cuz i think the tech is just giving me the go around.. and get my hands dirty.. dam its hard to trust mechanics with cars.. thust y i do my own shit but this time i thought someone with a lil more exp under the belt but its just not working out dont get me wrong he knows his shit but im very doubtful because i have been in and out of shops that tech just screw ppl over for dumb shit... if you know anyone that can help me out a mustang guru i hate to drop my car of at the mustang ranch so they can charge me 130 an hour
 
Posted by sj 50's (Member # 11042) on :
 
i found the issue its th f**ken cam its a non HO cam.. not firing right dam how can i have been so blind thanks for all ur replys they were a great help to narrowing it down to the dam cam
 




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