1993 missing bad
Thread Starter
Junior Member
Joined: Apr 2018
Posts: 2
Likes: 0
1993 missing bad
I have a 1993 4wd. Misses bad when on a hill or quickly accelerating. I just bought it a month ago, so I don't know what all has been done to it repair wise. Where should I start troubleshooting? Has 160000 miles.
Senior Member
Joined: Nov 2016
Posts: 180
Likes: 34
From: New England
It could be so many things...are you sure it' only under load or maybe it occurs all the time, but less noticeable.
when i got my 93 5.0, the guy told me it misses and engine light on.
engine light was a simple vacuum line, and the miss was a burnt up valve.
Do a compression test. Aside from just this issue, it will give you basic health of the engine.
when i got my 93 5.0, the guy told me it misses and engine light on.
engine light was a simple vacuum line, and the miss was a burnt up valve.
Do a compression test. Aside from just this issue, it will give you basic health of the engine.
Member
Joined: Aug 2017
Posts: 88
Likes: 2
I’d look into fuel pump / pressure if it’s under load. A tune up never hurts but it may not help and cost money. Get a fuel pressure guage and determine what it is, if possible have it visible while driving (be extremely careful) and see what the pressure does while you’re going uphill or accelerating. O
Member
Joined: Jan 2018
Posts: 11,256
Likes: 1,770
From: Memphis, TN, Earth, Milky Way
EFIs don't need "tune-ups" - just recommended maintenance, and repairs. They self-tune about 200x per second. This is the maintenance schedule, but it might be easier to read in the caption:
(phone app link)
If you're not sure that the PO followed that schedule, inspect the truck & catch up anything that needs to be done. If the symptom still exists, follow the Troubleshooting guide before Ch.1 in the Haynes manual:
(phone app link)
You should also put all the truck's details into your signature. Just for example: we need to know what ENGINE it has, but that's not all. Read this caption:
(phone app link)
If you need to check compression, this caption explains how:
(phone app link)
If it's a V8, this caption explains how to check the timing chain:
(phone app link)
(phone app link)
If you're not sure that the PO followed that schedule, inspect the truck & catch up anything that needs to be done. If the symptom still exists, follow the Troubleshooting guide before Ch.1 in the Haynes manual:
(phone app link)
You should also put all the truck's details into your signature. Just for example: we need to know what ENGINE it has, but that's not all. Read this caption:
(phone app link)
If you need to check compression, this caption explains how:
(phone app link)
If it's a V8, this caption explains how to check the timing chain:
(phone app link)
Martin
Joined: Jan 2011
Posts: 3,036
Likes: 260
From: Lehi, Utah
A set of plugs is cheap and easy to replace and also at the same time you can inspect plug wires and boots for condition. Had nearly same condition as you describe on sons truck and problem was one spark plug wire boot burnt and cracked.