timing problem
Thread Starter
|
Senior User
Joined: Aug 2003
Posts: 128
Likes: 0
From: lake elsinore, ca
timing problem
what am i supposed to set the timing light to? i cant find it in the books anywhere. also i got the engine to idle right and smooth but when i rev it and let it go back to idle the rpms drop to 500 and then tries to rev back up but then dies. i checked the idle thing on the throttle body but it was clean inside. so is this just the timing problem?
Senior User
Joined: May 2003
Posts: 135
Likes: 0
From: Florida
Check the voltage at the tps(make sure ignition key is on engine off)
should be 5 volts between orange and black and less then 1 volt at idle that would be voltage between green and black wires..
I had same problem i JUST NOW GOT IT RUNNING ...WITHOUT STALLING..
I had a short in the
wiring harness and the timing was off..
You can get codes off the pcm to give u an idea of which direction to go in..
should be 5 volts between orange and black and less then 1 volt at idle that would be voltage between green and black wires..
I had same problem i JUST NOW GOT IT RUNNING ...WITHOUT STALLING..
I had a short in the
wiring harness and the timing was off..You can get codes off the pcm to give u an idea of which direction to go in..
Last edited by quantalimo; Apr 21, 2004 at 11:21 PM.
Senior User
Joined: May 2003
Posts: 135
Likes: 0
From: Florida
https://www.ford-trucks.com/lc/lc.ph...tech/codes.htm
will tell you how to do all that..
http://www.broncodata.com/tech/codes.htm
U need a test light paper pencil paper clips ....
You should buy the hayes manual if u plan on working on this thing it is a pretty complex vehicle..the Code test is also in Hayes manual 12 bucks at any auto parts store...
will tell you how to do all that..
http://www.broncodata.com/tech/codes.htm
U need a test light paper pencil paper clips ....
You should buy the hayes manual if u plan on working on this thing it is a pretty complex vehicle..the Code test is also in Hayes manual 12 bucks at any auto parts store...
Trending Topics
Senior User
Joined: Mar 2004
Posts: 110
Likes: 0
From: South Texas, right on the border
I too have a 90 Bronco with a 5.0...and i am having the exact same problem. I thought it was the timing, so i checked and it was a little off and i adjusted it. But it was still doing the same thing! I was thinking that maybe my fuel filter was becoming clogged but alot of guys with similar year broncos have been saying its the throttle position sensor TPS. Please post with your results when your finished......cause i need help too!
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Thread Starter
|
Senior User
Joined: Aug 2003
Posts: 128
Likes: 0
From: lake elsinore, ca
well im taking my truck into my shop class so my old teacher can help me out, im also thinking it might just be a vacuum leak but i will try to pull the codes before i start messing with things, thanks for the info and ill write back to give you all a heads up on what happened
Lead Driver
Joined: Sep 2002
Posts: 9,182
Likes: 12
From: Gateway to the West
TPS could be the problem but a malfunctioning IAC will do the same thing. The symptoms sound like what happens when the IAC is disconnected (electrically). If its not functioning at all it will have the same effect as not being connected. Pulling codes should give you a good indication as to whether its the TPS or the IAC. If it idles fine when you start it and then falls on its face after you touch the pedal or put it in gear, remember EEC-IV engines go through about 30-60 seconds of warm-up unless the truck is put in gear or the driver taps the accelerator.
Senior User
Joined: May 2003
Posts: 135
Likes: 0
From: Florida
You can Check your TPS just look for the voltage key on engine off 5v orange - black and <1 volt but not less .5 volts than ( green to black wires)at idle....
you cAn pull throttle by hand and voltage should gradually go to 4.5-5 volts..
when u adjust timing make sure spout is disconnected......
we know all this...
U can adjust timing by ear if u have a sagging chain...even slightly advanced may give u non stalling results....Play with the riming a bit to get the best running results u can get...
you cAn pull throttle by hand and voltage should gradually go to 4.5-5 volts..
when u adjust timing make sure spout is disconnected......
we know all this...
U can adjust timing by ear if u have a sagging chain...even slightly advanced may give u non stalling results....Play with the riming a bit to get the best running results u can get...
New User
Joined: Apr 2004
Posts: 3
Likes: 0
i found the problem
i went to firestone and did a diagnostic check. The tps was fine it was a idle sensor that sits under the black cap right above the intake. In order to fix buy a idle sensor it controls the airflow in when idling
Thread Starter
|
Senior User
Joined: Aug 2003
Posts: 128
Likes: 0
From: lake elsinore, ca
i noticed on the directions for the cams i got (comp cams part# 31-255-5) that it said i had to set it 4 deg in advance so does that sound right cause i have mine set at 10deg and it idles at 650, sometimes would die and below 1500 rpms and it is hesitating, could this be the problem? ill try to change it tomorrow if i have time see if it fixes my problem.
