• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

What's left?


Rosberg1

New Member
Joined
Dec 23, 2011
Messages
26
Reaction score
0
Points
0
Location
Asheville, NC
Vehicle Year
1990
Make / Model
Ford
Engine Size
2.9 liter V6
Transmission
Manual
Here's my problem. I've got a 90 ranger with a 2.9. For some reason after driving it a ways it will miss or just fall on its face and will do it more frequently the farther I drive it. It misses a little at idle too. My check engine codes are 22,23, and 67. Which are MAP out of self test range, TPS out of self test range, and clutch switch circuit failure. I've replaced both the TPS and the MAP and nothing has changed. Also, when driving the check engine light goes off until I push the clutch in to change gears. So far I've replaced the TPS, MAP, FPR, Injectors, fuel filter, fuel pump, O2 sensor, several vacuum lines, the exhaust, the IAC valve, and rebuilt the top end. Is there anyone here who has experienced this and if so how did you fix it?
 


armadillon

Member
Joined
Aug 17, 2011
Messages
945
Reaction score
12
Points
18
Location
Austin, TX
Vehicle Year
93
Make / Model
Ford
Engine Size
3.0L
Transmission
Automatic
Sheesh, you did a good amount of replacing stuff. Definitely don't give up yet. Just curious, have you done cap and rotor/plug wires/plugs recently?
 

Rosberg1

New Member
Joined
Dec 23, 2011
Messages
26
Reaction score
0
Points
0
Location
Asheville, NC
Vehicle Year
1990
Make / Model
Ford
Engine Size
2.9 liter V6
Transmission
Manual
Oh yeah, I forgot those on my list. I did the plugs and wires but the cap and rotor were new when I bought it. I inspected them for cracks and corrosion but they were mint.
 

armadillon

Member
Joined
Aug 17, 2011
Messages
945
Reaction score
12
Points
18
Location
Austin, TX
Vehicle Year
93
Make / Model
Ford
Engine Size
3.0L
Transmission
Automatic
I doon't have the 2.9 so please excuse my ignorance if you don't have one of these: On my 89 5.0 I DID have a problem similar to this where after a while it would just die on me. There was a module or sensor underneath the rotor on the distributor. Also the ignition control module would give me sh*t as well
 

laminad

New Member
Joined
Apr 24, 2012
Messages
22
Reaction score
0
Points
0
Vehicle Year
1987
Make / Model
Ford
Transmission
Manual
Does it fall on its face when giving it gas but runs fine as soon as you start to let up. Mine did that and I found it was the dash ground. Mine was on the windshield wiper motor. Go figure.
 

Rosberg1

New Member
Joined
Dec 23, 2011
Messages
26
Reaction score
0
Points
0
Location
Asheville, NC
Vehicle Year
1990
Make / Model
Ford
Engine Size
2.9 liter V6
Transmission
Manual
That is EXACTLY what it does. It seems I may have some wires to check. That may be the random rigged wire whose purpose is unknown. There is another real ground wire attached to it but doesn't seem to reach anything.
 

Rosberg1

New Member
Joined
Dec 23, 2011
Messages
26
Reaction score
0
Points
0
Location
Asheville, NC
Vehicle Year
1990
Make / Model
Ford
Engine Size
2.9 liter V6
Transmission
Manual
Grounded the wire, reset timing properly, and test drove with and without the spout and received the same result.
 

Psychopete

Well-Known Member
Joined
Aug 10, 2007
Messages
3,201
Reaction score
29
Points
48
Location
FW, IN
Transmission
Automatic
Is this a truck you just purchased? Some history can give some clues.

What is your TPS reading voltage wise at idle and WOT? The screw could be turned in too far by someone who thought that was an idle adjustment screw to make it run "good enough." Check ref voltage to MAP, make sure your engine vacuum is acceptable, and you may want to replace the vacuum line to the MAP sensor.

Were these KOEO, CM, or KOER codes?
 

Rosberg1

New Member
Joined
Dec 23, 2011
Messages
26
Reaction score
0
Points
0
Location
Asheville, NC
Vehicle Year
1990
Make / Model
Ford
Engine Size
2.9 liter V6
Transmission
Manual
I purchased it back in December with this issue for 500 bucks. I'm new to this engine and when I first got it I turned the screw thinking it was an idle adjustment. These were KOEO codes, TPS was tested KOEO. I'm reading .709-.714 at idle and 3.944 at WOT, voltage in is 4.46 now that I tested using the ground at the TPS. Tried adjusting it to get .9 volts and had to turn it all the way in.
 

Rosberg1

New Member
Joined
Dec 23, 2011
Messages
26
Reaction score
0
Points
0
Location
Asheville, NC
Vehicle Year
1990
Make / Model
Ford
Engine Size
2.9 liter V6
Transmission
Manual
MAP reference voltage is 4.3 KOEO
 

Rosberg1

New Member
Joined
Dec 23, 2011
Messages
26
Reaction score
0
Points
0
Location
Asheville, NC
Vehicle Year
1990
Make / Model
Ford
Engine Size
2.9 liter V6
Transmission
Manual
So I ohmed the harness between the ECM and the MAP and TPS and everything spec'd out. I'm thinking the ECM is bad?
 

Rosberg1

New Member
Joined
Dec 23, 2011
Messages
26
Reaction score
0
Points
0
Location
Asheville, NC
Vehicle Year
1990
Make / Model
Ford
Engine Size
2.9 liter V6
Transmission
Manual
LOL, I just cross referenced the code on Oreiley's website and the previous owner put a 2wd computer in it.
 

Earl43P

Well-Known Member
U.S. Military - Veteran
Joined
Aug 7, 2007
Messages
3,159
Reaction score
38
Points
48
Location
Farmington, Pa
Vehicle Year
2019
Make / Model
Ford F250 4WD
Engine Size
3.0
Transmission
Manual

Rosberg1

New Member
Joined
Dec 23, 2011
Messages
26
Reaction score
0
Points
0
Location
Asheville, NC
Vehicle Year
1990
Make / Model
Ford
Engine Size
2.9 liter V6
Transmission
Manual
Yep, somewhere along the way they share both the orange/ white (power from ECM) and black/ white wires (ground). Its a manual, thanks for the offer though. I'm sure the 2-wheel 4-wheel doesn't matter, its just funny to me because it seems this thing was built almost entirely of spare parts. The other day I was underneath it putting a new muffler on it and noticed it had 3 different brands of shocks on it and the rear axle is narrower than the front by 2.25 inches!
 
Last edited:

Psychopete

Well-Known Member
Joined
Aug 10, 2007
Messages
3,201
Reaction score
29
Points
48
Location
FW, IN
Transmission
Automatic
How far closed is the throttle plate? That voltage is awfully low. Given the top end has been gone through and IAC is replaced, check the engine vacuum no doubt. If idle is high with throttle plate closed, there's a vacuum leak somewhere. What happens when the IAC is disconnected at idle? I wonder if the computer has this open all of the time for some reason(??) It's tedious, but capping each off each vacuum tap one by one might be something to try.

Vacuum leak is going to screw up MAP readings. That's why it's important to check the engine vacuum to make sure the MAP is getting a good vacuum signal.

TPS is probably set too low, which is causing the other code.

Also definitely get the engine up to temp and run a KOER test.
 
Last edited:

Sponsored Ad


Sponsored Ad

Members online

Member & Vendor Upgrades

For a small yearly donation, you can support this forum and receive a 'Supporting Member' banner, or become a 'Supporting Vendor' and promote your products here. Click the banner to find out how.

Truck of The Month


Kirby N.
March Truck of The Month

Recently Featured

Want to see your truck here? Share your photos and details in the forum.

Follow TRS On Instagram

TRS Events

25th Anniversary Sponsors

Check Out The TRS Store


Sponsored Ad


Sponsored Ad

Sponsored Ad


Amazon Deals

Top