89 F-150 Problem
Thread Starter
|
New User
Joined: Mar 2003
Posts: 2
Likes: 0
From: Connecticut
89 F-150 Problem
I have just had a bolt removed from my pass. side exhaust manifold that had snapped off. I removed the intake, and the head to have it machined out. Replaced all the gaskets. Everything looks fine. When I start the truck up the oil pressure goes to normal. If I put it in gear, it drops out completely. If I give it gas it goes right back up to normal. It almost wants to stall out when I put it into gear or come to a stop light. I replaced the gauge sender. I had it hooked up to a computer it reads clear. I had a compression test done on every cylinder it reads like the truck is new. I let the truck idle in park and it sounds fine no knocking from no oil. It is a little rough on start-up. But it eventually it smoothes out. What could it be. The gauge itself? Idle motor? Like I said I have done EVERY computer test on this thing and come up with nothing! PLEASE HELP!!
Elder User
Joined: Jun 2002
Posts: 519
Likes: 0
From: CT
89 F-150 Problem
- for starters -
The gauge is an idiot gauge (on or off) check/clean connection where the wire connects to pressure sending unit.
Might just be a poor crimp - intermittent connection.
-- one test is --
Touching wire to ground while truck is running should move gauge to Normal - it was the driver side head you pulled? If gauge reads normal when you touch ground then its either the connection or the sending unit (if you have oil pressue). Check the ground connection.
blu
The gauge is an idiot gauge (on or off) check/clean connection where the wire connects to pressure sending unit.
Might just be a poor crimp - intermittent connection.
-- one test is --
Touching wire to ground while truck is running should move gauge to Normal - it was the driver side head you pulled? If gauge reads normal when you touch ground then its either the connection or the sending unit (if you have oil pressue). Check the ground connection.
blu
Lead Driver
Joined: Feb 2003
Posts: 8,140
Likes: 4
From: Oak Harbor, OH
89 F-150 Problem
I agree with the gauge being a smart idiot light, however I don't agree with the "ground the wire and the gauge will read normal." As a general a rule you gorund the gauge it should go all the way to the H on the gauge, if not then you have a faulty gauge. Anyway the best way to get your oil pressure readind is a REAL gauge from sunpro or the like,
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
89 F-150 Problem
The gauge is probably showing the correct pressure, so I'd fix the idle problem. Clean the IAC to see if it clears up, and if it helps, replace it - it was already close to death. Also, test the TPS by Haynes procedure and make sure you have no vacuum leaks & the timing is set to 10°BTDC.
