5.0 has starting problems
Thread Starter
|
Senior User
Joined: Apr 2004
Posts: 207
Likes: 0
From: Missouri
5.0 has starting problems
The truck is a '92, has the 302, and the M5 5 speed, 2 wd, with 220 thousand miles, and no engine mods.
Sometimes, the truck will start just fine, mainly when it's cold, but after driving awhile, and shutting it off, when I get back in it, it won't start, or else it will start, but sputter, and act like it's out of gas, and cough, buck, and run rough, then after a few seconds, it will just start running normal again.
Also, it sometimes has a real bad hesitation between 1000 and 1500 RPM, to the point of backfiring, and when it does this, the exhaust really stinks.
I've checked for codes, and only one came up, that was for the power steering pressure switch (I didn't turn the wheel enough during the key on-engine running part).
The timing is at 10 degrees BTDC, wasn't able to find the spout connector, so this probably isn't the right timing...?
When it doesn't start, it cranks over good, but just will not start, I have been lightly tapping on the IAC, sometimes it seems to help, and other times it doesn't.
When running, I can unplug it, and the idle changes slightly.
I need to run a compression test, I know, and maybe replace the fuel filter, but any suggestions would be much appreciated!
edit: engine has 2 month old plug wires, cap, rotor, and plugs are 2 years old, probably getting new coil this week.
just read that mybe the MAP sensor may have low vacuum, how would i go about checking this, and where is the map sensor at?
Sometimes, the truck will start just fine, mainly when it's cold, but after driving awhile, and shutting it off, when I get back in it, it won't start, or else it will start, but sputter, and act like it's out of gas, and cough, buck, and run rough, then after a few seconds, it will just start running normal again.
Also, it sometimes has a real bad hesitation between 1000 and 1500 RPM, to the point of backfiring, and when it does this, the exhaust really stinks.
I've checked for codes, and only one came up, that was for the power steering pressure switch (I didn't turn the wheel enough during the key on-engine running part).
The timing is at 10 degrees BTDC, wasn't able to find the spout connector, so this probably isn't the right timing...?
When it doesn't start, it cranks over good, but just will not start, I have been lightly tapping on the IAC, sometimes it seems to help, and other times it doesn't.
When running, I can unplug it, and the idle changes slightly.
I need to run a compression test, I know, and maybe replace the fuel filter, but any suggestions would be much appreciated!
edit: engine has 2 month old plug wires, cap, rotor, and plugs are 2 years old, probably getting new coil this week.
just read that mybe the MAP sensor may have low vacuum, how would i go about checking this, and where is the map sensor at?
Last edited by FordTruckFreeek; Feb 6, 2005 at 08:12 PM.
Tuned
Joined: Jun 2003
Posts: 489
Likes: 1
if it is running real rich, it might be your ECT sensor. Mine was bad and it would start ok when cold...run not too good in the lower rpm range and the exhaust stunk. When I would try to start it hot, I would have to have it floored in order for it to catch. I got a code for my ECT sensor though. Fixed my problems and now it runs great.
