Possible EGR valve problem?
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Possible EGR valve problem?
I have a 1995 Ford F150 with 351 5.8L. When I crank the truck it doesn't idle right, when I give it a little gas it hesitates, and feels like it has no power in drive. Black smoke and liquid (not sure if it is gas or water) comes from the tailpipe. I've already replaced the fuel filter and the fuel pump seems to be working fine. I'm wondering if it is the EGR valve or something.
Anyone have any suggestions? Anything would be appreciated!
Anyone have any suggestions? Anything would be appreciated!
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
Sounds more like a bad Fuel Pressure Regulator (FPR).
Pull off the vacuum line on top of the FPR and turn the key on and off with a cold engine. If any fuel comes out of the nipple on top it is bad.
Pull off the vacuum line on top of the FPR and turn the key on and off with a cold engine. If any fuel comes out of the nipple on top it is bad.
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
You need to run the self-test and see what codes you have.
Post if they are KOEO, CM or EOER codes.
If you do not know how go to the link below.
Ford Fuel Injection » How To Run a Self-Test
If no codes you may have a bad TPS.
Post if they are KOEO, CM or EOER codes.
If you do not know how go to the link below.
Ford Fuel Injection » How To Run a Self-Test
If no codes you may have a bad TPS.
Freshman User
Joined: Sep 2013
Posts: 40
Likes: 1
From: San Antonio, TX
Sorry to revive a very old post, but I have the exact same issues. I have a '95 F150 4.9L EFI with E40D. Experiencing the same issues as above. Sluggish after it warms up. Hard to get it over 30-40 without really giving it gas. Hard start, hesitates when accelerating. Codes I get are the following:
KOEO
Tested 111 with CM codes of
181 - (Trucks ONLY): HEGO (HO2S) sensor fault unable to switch / lean during part throttle
327 - EVP/EPT circuit below minimum voltage
KOER
Tested the 6 Cyl with codes of
172 - HEGO (HO2S) sensor fault/lean
412 - Cannot control RPM during KOER high RPM check
The EGR looks to be working properly when you give it gas. Checked all the vacuum lines. Cleaned all the connectors on sensors just for the heck of it. Only thing I've done different recently was replace the transmission cooler lines. My first guess is it's the EGR valve that's clogged/dirty maybe or HEGO Sensor is dirty/bad. Any opinions/suggestions?
KOEO
Tested 111 with CM codes of
181 - (Trucks ONLY): HEGO (HO2S) sensor fault unable to switch / lean during part throttle
327 - EVP/EPT circuit below minimum voltage
KOER
Tested the 6 Cyl with codes of
172 - HEGO (HO2S) sensor fault/lean
412 - Cannot control RPM during KOER high RPM check
The EGR looks to be working properly when you give it gas. Checked all the vacuum lines. Cleaned all the connectors on sensors just for the heck of it. Only thing I've done different recently was replace the transmission cooler lines. My first guess is it's the EGR valve that's clogged/dirty maybe or HEGO Sensor is dirty/bad. Any opinions/suggestions?
Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
Sorry to revive a very old post, but I have the exact same issues. I have a '95 F150 4.9L EFI with E40D. Experiencing the same issues as above. Sluggish after it warms up. Hard to get it over 30-40 without really giving it gas. Hard start, hesitates when accelerating. Codes I get are the following:
KOEO
Tested 111 with CM codes of
181 - (Trucks ONLY): HEGO (HO2S) sensor fault unable to switch / lean during part throttle
327 - EVP/EPT circuit below minimum voltage
KOER
Tested the 6 Cyl with codes of
172 - HEGO (HO2S) sensor fault/lean
412 - Cannot control RPM during KOER high RPM check
The EGR looks to be working properly when you give it gas. Checked all the vacuum lines. Cleaned all the connectors on sensors just for the heck of it. Only thing I've done different recently was replace the transmission cooler lines. My first guess is it's the EGR valve that's clogged/dirty maybe or HEGO Sensor is dirty/bad. Any opinions/suggestions?
KOEO
Tested 111 with CM codes of
181 - (Trucks ONLY): HEGO (HO2S) sensor fault unable to switch / lean during part throttle
327 - EVP/EPT circuit below minimum voltage
KOER
Tested the 6 Cyl with codes of
172 - HEGO (HO2S) sensor fault/lean
412 - Cannot control RPM during KOER high RPM check
The EGR looks to be working properly when you give it gas. Checked all the vacuum lines. Cleaned all the connectors on sensors just for the heck of it. Only thing I've done different recently was replace the transmission cooler lines. My first guess is it's the EGR valve that's clogged/dirty maybe or HEGO Sensor is dirty/bad. Any opinions/suggestions?
Here are some common symptoms of a bad or failing throttle position sensor to watch for:
- Car won't accelerate, lacks power when accelerating, or accelerates itself. ...
- Engine won't idle smoothly, idles too slowly, or stalls. ...
- Car accelerates, but won't exceed a relatively low speed, or shift up.
Lead Driver
Joined: May 2011
Posts: 5,772
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Freshman User
Joined: Sep 2013
Posts: 40
Likes: 1
From: San Antonio, TX
I tried the test SubFord mentioned above on the FPR.
Edit....
So i took a picture of the TPS so i could find a match at the auto parts store and lo and behold, what do I find?
I'm missing a screw!
Edit....
So i took a picture of the TPS so i could find a match at the auto parts store and lo and behold, what do I find?
I'm missing a screw!
Last edited by FordCigarMan; Sep 20, 2018 at 10:21 PM. Reason: Additional information
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Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
While I am certainly not disagreeing with you I am Just trying to widen my knowledge base. What is it you detect in his symptoms that would cause low fuel pressure? Sandy
Lead Driver
Joined: May 2011
Posts: 5,772
Likes: 442
Symptoms that I'd want a fuel pressure test to shed some light on: hesitation and lean primarily.
Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
it has just as much to do with "order of operations" as it does an evaluation of his symptoms. Fuel pressure tests are so easy that it should be checked, along with codes, before going into testing everything *****-nilly.
Symptoms that I'd want a fuel pressure test to shed some light on: hesitation and lean primarily.
Symptoms that I'd want a fuel pressure test to shed some light on: hesitation and lean primarily.
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