2.9 running rough
Thread Starter
|
New User
Joined: Jun 2004
Posts: 7
Likes: 0
2.9 running rough
Hello everyone, I have an 86 ranger ,2.9 4wd automatic and its running rough. I replaced the o2 sensor,fuel pressure reg, Complete tuneup and it still runs rough. I pulled the codes and got a code 33,25 and 74. Any help is greatly appreciated. Bill
Postmaster
Joined: Dec 2001
Posts: 3,742
Likes: 2
From: UT
25 is a knock sensor code. The only time I've seen it, it was a result of not giving it enough of a "goose" for the dynamic response portion of the KOER test. 74 is almost always a result of not pressing the brake pedal after the engine id during the KOER test. I expect you'll clear both of these codes up by repeating the KOER test and remembering to press the brake after engine id is output, then give it a good goose when the goose pulse is received.
The 33 is probably at the heart of your rough running. Was this a KOER code as well, or was it a KOEO or continuous memory code? Did you get a pass code for any portion of the code output? A 33 is an EGR code. Specific diagnostic procedure will vary depending on whether it's a KOEO 33, KOER 33, or a CM 33. 1st check would probably be a good visual check of the wiring and vacuum hoses associated with the EGR system.
The 33 is probably at the heart of your rough running. Was this a KOER code as well, or was it a KOEO or continuous memory code? Did you get a pass code for any portion of the code output? A 33 is an EGR code. Specific diagnostic procedure will vary depending on whether it's a KOEO 33, KOER 33, or a CM 33. 1st check would probably be a good visual check of the wiring and vacuum hoses associated with the EGR system.
Postmaster
Joined: Dec 2001
Posts: 3,742
Likes: 2
From: UT
The KOEO 89 is related to the 3-4 shift circuit. I would guess that you don't have 4th gear. But that doesn't tell us why the engine runs rough. In the enterest of fixing everything right, you should probably fix that sometime.
As for the KOER 33. Let me preface by saying that I've never had to deal with EGR problems on my BII, yet. 1st thing I would do is go to the library and get a copy of a good manual and find the circuit "pinpoint" test for a KOER 33. Vacuum lines were a good start. Were any of them plugged? Next would be wiring. Does the wiring between the PCM and the EGR sensor seem intact. Then, using the output state test (after the continuous memory codes are output see www.dalidesign.com/hbook/eectest.html) and a vacuum pump/gauge, see if the EGR solenoid is functional.
As for the KOER 33. Let me preface by saying that I've never had to deal with EGR problems on my BII, yet. 1st thing I would do is go to the library and get a copy of a good manual and find the circuit "pinpoint" test for a KOER 33. Vacuum lines were a good start. Were any of them plugged? Next would be wiring. Does the wiring between the PCM and the EGR sensor seem intact. Then, using the output state test (after the continuous memory codes are output see www.dalidesign.com/hbook/eectest.html) and a vacuum pump/gauge, see if the EGR solenoid is functional.
Thread Starter
|
New User
Joined: Jun 2004
Posts: 7
Likes: 0
TODAY I REPLACED THE EGR VALVE AND CLEARED THE CODES. I DROVE AROUND FOR A WHILE AND RECHECKED THE CODES BECAUSE IT WAS STILL RUNNING ROUGH. I GOT A CODE 33 AGAIN IN KOER AND IN KOEO I GOT A CODE 15
(eec processor KEEP ALIVE memory rom test failed). DOES ANYONE KNOW WHAT THAT MEANS AND DOES IT HAVE ANYTHING TO DO WITH THE CODE 33? ANY REPLY IS GREATLY APPRECIATED. I ALSO MADE SURE THE EGR PORT WAS CLEAR OF CARBON BEFORE INSTALLING THE NEW EGR.
(eec processor KEEP ALIVE memory rom test failed). DOES ANYONE KNOW WHAT THAT MEANS AND DOES IT HAVE ANYTHING TO DO WITH THE CODE 33? ANY REPLY IS GREATLY APPRECIATED. I ALSO MADE SURE THE EGR PORT WAS CLEAR OF CARBON BEFORE INSTALLING THE NEW EGR.
Last edited by Bill864x4; Sep 1, 2004 at 06:32 PM.
Postmaster
Joined: Dec 2001
Posts: 3,742
Likes: 2
From: UT
Code 15 suggests that the computer doesn't have power to the KAM pin. Check the KAM power supply at the computer.
A brief, gentle scolding for not diagnosing the 33 correctly
.
The EGR valve is only one component in the EGR system, and seems to be the least likely to fail. More often it's a) a wiring fault in the EGR position sensor circuit, b) a bad EGR position sensor, c) clogged or broken vacuum lines (which you've checked), or d) an EGR solenoid that isn't opening. You're not getting an EGR code for the KOEO test, which suggests that the computer and EGR sensor can at least talk to each other on some basic level. I would start by checking the EGR solenoid.
1) Get a vacuum pump and gauge (one of those little hand pumps will do just fine)
2) Disconnect the vacuum line from the solenoid (on mine it's over on the fender near the air filter housing) to the EGR valve. Plug your vacuum pump into the solenoid.
3) Enter output state test (see above).
4) Pull a vacuum on the solenoid. Does it hold a vacuum?
5) Press throttle to actuate solenoid. Does it hold a vacuum now? With each succesive press of the throttle, you should be able to see the solenoid opening and closing based on whether or not it holds vacuum.
A brief, gentle scolding for not diagnosing the 33 correctly
.The EGR valve is only one component in the EGR system, and seems to be the least likely to fail. More often it's a) a wiring fault in the EGR position sensor circuit, b) a bad EGR position sensor, c) clogged or broken vacuum lines (which you've checked), or d) an EGR solenoid that isn't opening. You're not getting an EGR code for the KOEO test, which suggests that the computer and EGR sensor can at least talk to each other on some basic level. I would start by checking the EGR solenoid.
1) Get a vacuum pump and gauge (one of those little hand pumps will do just fine)
2) Disconnect the vacuum line from the solenoid (on mine it's over on the fender near the air filter housing) to the EGR valve. Plug your vacuum pump into the solenoid.
3) Enter output state test (see above).
4) Pull a vacuum on the solenoid. Does it hold a vacuum?
5) Press throttle to actuate solenoid. Does it hold a vacuum now? With each succesive press of the throttle, you should be able to see the solenoid opening and closing based on whether or not it holds vacuum.
Trending Topics
Thread Starter
|
New User
Joined: Jun 2004
Posts: 7
Likes: 0
I just tested the vacuum solenoid and its shot! ill pick one up in the morning and put one on. I also checked the voltage on the plug for the egr position sensor. The book says with no vacuum aplied it should be around .8 volts and ive got 3.2 volts. Do you think it sounds like that should be replaced as well or should i start with just the solenoid? I also pulled the main plug on the computer to check for that koer code 15 and i dont know what wire is the kam wire. Would you happen to know what color it is? Thank you very much for all your knowledable information.......Bill
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
Thread Starter
Forum
Replies
Last Post
Bill Smith87
1983 - 2012 Ranger & B-Series
5
Aug 1, 2006 01:44 AM
