This is topic 5.0 driving issues??? input needed guys in forum Tech Talk at Northern California Ford Owners  .


To visit this topic, use this URL:
https://californiafords.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=6;t=025087
Posted by 94gtcoupe (Member # 10974) on :
 
i have a 94 gt 5.0 the car starts and runs but after running a short period of time and then i start to drive it the car starts to back fire and loose power. i know i have some low compression but i cant seem to pin point why the car isnt driveable. i have a kill switch leading to my fuel pump so this is one thing that i have learned...

if im driving and it starts to back fire and lose power and then i turn off my fuel pump and then turn it back on the car drives fine again for a mile or so and then i have to repeat the step. [Frown] i need some help guys whats your thoughs. thanks in advance [patriot]

[ September 12, 2011, 09:12 PM: Message edited by: 94gtcoupe ]
 
Posted by SLOWSN95 (Member # 8269) on :
 
Try to bypass the kill switch. What if you just turn off the car and then restart it.. how does it run? Or does in only run fine for that minute after flipping the switch on the fuel pump?
 
Posted by 94gtcoupe (Member # 10974) on :
 
same thing either way. if i turn off the car or if i just use the kill switch.

so heres a lil run down on some of the latest work performed:

replaced the head gasket on the drivers side due to the gasket failing on me. the car was running fine before hand and ever since this change the car hasnt been running right. and ive even made sure my Rockers are all torqued right and timing seems to be all good as well. [Frown]
 
Posted by SLOWSN95 (Member # 8269) on :
 
You said you have low compression but you've replaced the head gasket.. whats with that?
 
Posted by 94gtcoupe (Member # 10974) on :
 
well the motor has always had a lil lower compression but not in the dangerous way. the motor is out of a 93 gt and its just bolt ons with gt40 intake. and ive had the motor 2 years with low compression and im goin with boost soon so it works.

any other ideals?
 
Posted by SLOWSN95 (Member # 8269) on :
 
Any other modifications to the car? What color are your spark plugs? Where did you set your timing?
 
Posted by 94gtcoupe (Member # 10974) on :
 
timing is at 10 now car starts and idles great
spark plugs are oem copper plugs motorcraft

list of mods are

gt40 intake
70mm tb
shortie mac headers, off road x
bbk cold air
msd cap rotor
smog pump delete
new fuel pump 190 oem
373 gears
its a 5speed
 
Posted by 95gtdrop (Member # 7478) on :
 
does it fluctuate idles for a bit before it dies? you can put your timing at12-14* and possibly gain a bit also with those mods.
 
Posted by SLOWSN95 (Member # 8269) on :
 
I don't think he should bump his timing to gain more.. he needs to figure out why his car is losing power and dying out.

Have you pulled out your spark plugs to see what color they are?
 
Posted by 95gtdrop (Member # 7478) on :
 
i left the afterwards part out. aftrwards bumop the timing. [patriot]
 
Posted by SLOWSN95 (Member # 8269) on :
 
quote:
Originally posted by 95gtdrop:
i left the afterwards part out. aftrwards bumop the timing. [patriot]
Thats more like it [patriot]
 
Posted by 94gtcoupe (Member # 10974) on :
 
car never dies at a idle it will just loose power as im driving and backfire then it will be to the point where if i hit the gas all it does is backfire and not move due tp lack of power. but as soon as i turn the car off and back on it will be ok for a lil bit
 
Posted by SLOWSN95 (Member # 8269) on :
 
No check engine light?
 
Posted by 94gtcoupe (Member # 10974) on :
 
no light sir [Frown]
 
Posted by triple b (Member # 8763) on :
 
check the plugs! GAWD DAM it could be because your running lean did use use the old O2 sensors did you forget to pulg them back in?
 
Posted by nasty93 (Member # 8935) on :
 
i v had similar issues with different 5.0s. off timing,dirty mass air meter,vacuum leaks,fuel pressure wrong...just some of the things i d look for.
 
Posted by bigstangs (Member # 7920) on :
 
Did you put the spout back in after timing happen to me and took me a couple hours to find the problem felt like a dumb ass after that
 
Posted by 1bad93 (Member # 11094) on :
 
quote:
Originally posted by triple b:
check the plugs! GAWD DAM it could be because your running lean did use use the old O2 sensors did you forget to pulg them back in?
or an injector that is open when its not supposed to be..........
 
Posted by 94gtcoupe (Member # 10974) on :
 
how could i test the injectors?
 
Posted by 94gtcoupe (Member # 10974) on :
 
how could i test the injectors?
 
Posted by 94gtcoupe (Member # 10974) on :
 
ttt i still have the issue with driving once the car warms up it drives like crap. doesnt over heat but will loose power and backfire. mods are listed above was thinking maybe the o2s are bad but i need some advice here thanks guys [Confused]
 
Posted by 94gtcoupe (Member # 10974) on :
 
ttt can anyone give some info to save a mustang in need
 
Posted by SteveL (Member # 1241) on :
 
Did you use the same thickness head gasket?

Since the problem started after changing the gasket, I would double check the adjustment on the pushrods. Maybe, if the gasket is a bit thinner than the one you replaced, you're hanging an exhaust valve open.
 




Fueled by Ford Mustang Owners
on CaliforniaFords.com