Getting Ready To Set My Car On Fire

1990_LX

1990_LX

Clubhouse Moderator
#1
#1
So the thing still runs like absolute shit, it back fires, revs slow, sounds like garbage, and shakes. It has all new plugs, wires, cap/rotor, distributor, vacuum lines and caps, fuel filter, fresh gas, ect ect. I did a compression test and all of the cylinders were in the high 150s. I have a Mallory regulator on it that is a return style and it's showing around 5-5.5 psi of pressure. I'm still using the stock lines, so I was considering running some 3/8th feed and return since it's carbed. Does anyone think it could be running so bad as a result of the carb? I'm not exactly sure how old it is( and I hate Edelbrock carbs anyway) or is it more timing? Here is a video....

1989 Mustang LX 5.0 - YouTube
 
adkmach1

adkmach1

Well-Known Member
#2
#2
Check the timing, it might of moved. Make sure the firing order is correct and all the wires are on tight. Simple things can cause havoc to a car.
 
adkmach1

adkmach1

Well-Known Member
#7
#7
Check your timing first, if your time is way off you might want to pull the valve covers off to see if you bent any push rods.
 
AdirondackFox08

AdirondackFox08

Member Plus
#8
#8
92BIGREDBEAST said:
You dizzy must be off a tooth or two from the sound of it:
Click to expand...
If you are off a tooth or two you won't be able to advance or retard the timing enough to get it right. You should probably take the dizzy back out and crank the number one piston to tdc at the compression stroke and put the dizzy back in with the rotor pointing at that cylinder. Then set the timing from there.

adkmach1 said:
Check your timing first, if your time is way off you might want to pull the valve covers off to see if you bent any push rods.
Click to expand...
You should check the push rods too, I remember you saying on fb that you were having problems with the timing and one of push rods may have been bent during that.
 
1990_LX

1990_LX

Clubhouse Moderator
#9
#9
I tried going a tooth advanced and a tooth retarded but it only got worse. I had restabbed the distributor a few times as I thought it was that as well and also checked the firing order numerous times. I even tried the non HO firing order just for the heck of it but it is definitely an HO. I pulled out all of the push rods but haven't checked them for straightness. If it's not that than maybe it's a collapsed lifter? Running out of ideas....
 
Chief Gilly

Chief Gilly

Member Plus
#10
#10
You could try pulling one S/P wire at a time and put it back if the idle gets worse. Pull each one, one at a time, and see if the idle stays the same when one is pulled off then that would mean that particular plug or wire or that point in the distributor is bad. Second, spray some ether or starting fluid LIGHTLY over vacuum hoses, while it's idling, to see if you have a vacuum leak .
Just some ideas :confused:
 
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