88 ranger 2.9 surging and missing when cold
Thread Starter
|
New User
Joined: Apr 2004
Posts: 18
Likes: 0
88 ranger 2.9 surging and missing when cold
I have a 88 ford ranger 2.9 when it is cold it starts to surge and the check enginge light comes on. The light will stay on and go off as the surging ramps up and down. It ranges from 800 to 2000 rpms. After the engine has run awhile it stops. I have replaced the o2 sensor, voltage regulator and did a tune up with no luck and suggestions would be great thanks.
Postmaster
Joined: Dec 2001
Posts: 3,742
Likes: 2
From: UT
KOER 13 is the only trouble code? Does that mean you get pass (11) from both KOEO and continuous memory (CM)? When the CEL comes on while the engine's running it should store a code in CM. If it isn't storing a code, then that suggests to me that there might be something wrong in the wiring to the computer. Might check KAM power supply, main PCM power supply, and computer grounds.
Have you checked fuel pressure? vacuum? compression? base timing (SPOUT removed)? other?
Have you checked fuel pressure? vacuum? compression? base timing (SPOUT removed)? other?
Postmaster
Joined: Dec 2001
Posts: 3,742
Likes: 2
From: UT
According to my code list 98 and 13 have to be KOER codes. 51 either KOEO, KOER, or CM. What type of code is the 51: KOEO, KOER, or CM?
I don't see 51's very often, so that makes me think that there is a short in the ECT sensor circuit somewhere. If this is a hard fault (KOEO/KOER code), then it shouldn't be too hard to track down with a voltmeter and a wiring diagram.
I don't see 51's very often, so that makes me think that there is a short in the ECT sensor circuit somewhere. If this is a hard fault (KOEO/KOER code), then it shouldn't be too hard to track down with a voltmeter and a wiring diagram.
Thread
Thread Starter
Forum
Replies
Last Post
jrgrtx
1994.5 - 1997 7.3L Power Stroke Diesel
9
Jul 26, 2017 05:06 PM
Benjamin Allison
1987 - 1996 F150 & Larger F-Series Trucks
2
Feb 3, 2017 01:30 PM
The Phenom
1983 - 2012 Ranger & B-Series
0
Feb 26, 2005 12:22 PM
