yj sputters while driving... idles fine... only happens when at operating temp - JeepForum.com
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post #1 of 29 Old 07-22-2013, 05:09 PM Thread Starter
mdoddroe
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Join Date: Jul 2013
Location: orion
Posts: 8
yj sputters while driving... idles fine... only happens when at operating temp

Specs
95 Jeep yj rio grande
2.5L 4cyl
80K miles
Auto Trans

Jeep sputters when driving... Occurs mostly at cruising speeds 40-65 mph but after engine is warm it occurs at all speeds. Doesn't occur in neutral, just when i'm giving it gas. Doesn't happen when engine is cold, so when I first get up it drives fine. This only occurs when engine is warm and it's intermittent. No codes at all other than defaults. Feels like it's not getting a constant stream of gas and it loses power going uphill.

What I've already replaced:
O2 sensor
Spark plugs
Coolant temp sensor
Fuel filter

Any suggestions?

I have a hint it's the fuel pump but just wanted to change out these cheap ones first

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post #2 of 29 Old 07-22-2013, 05:35 PM
bigbossd1030
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1995 YJ Wrangler 
 
Join Date: Feb 2010
Location: Edmonton, AB
Posts: 2,514
Quote:
Originally Posted by mdoddroe
Specs
95 Jeep yj rio grande
2.5L 4cyl
80K miles
Auto Trans

Jeep sputters when driving... Occurs mostly at cruising speeds 40-65 mph but after engine is warm it occurs at all speeds. Doesn't occur in neutral, just when i'm giving it gas. Doesn't happen when engine is cold, so when I first get up it drives fine. This only occurs when engine is warm and it's intermittent. No codes at all other than defaults. Feels like it's not getting a constant stream of gas and it loses power going uphill.

What I've already replaced:
O2 sensor
Spark plugs
Coolant temp sensor
Fuel filter

Any suggestions?

I have a hint it's the fuel pump but just wanted to change out these cheap ones first
TPS? Mine would do something similar, didn't need a hill to loose the power on though. I found if I shut it off then back on it would be fine for about another 20 mins, but would happen again. The cel didn't come on for this for a good week or so. Then it came on so I ran the codes, got a 24 iirc. I am thinking that if it was the fuel pump, wouldn't it do it all the time, like regardless of temp???

Sent from my iPhone, probably because I am bored at work.

/l ,[____],
l----L-[]lllllll[]-
()_)-()_)--o)_)

OFFICIAL JEEPER
Any Jeepers in Edmonton, AB
I am on channel 33.

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post #3 of 29 Old 07-22-2013, 07:20 PM
clush
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1994 YJ Wrangler 
 
Join Date: Jul 2009
Location: Lexington
Posts: 255
Mine had similar symptoms and a new fuel pump fixed it
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post #4 of 29 Old 07-22-2013, 07:24 PM Thread Starter
mdoddroe
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Join Date: Jul 2013
Location: orion
Posts: 8
Yea that's what i'm leaving toward. I'm going to get the pressure tested in the fuel lines then ill go from there. Got a sending unit and pump for $140.
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post #5 of 29 Old 07-22-2013, 09:40 PM
zombiechief
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1990 YJ Wrangler 
 
Join Date: Aug 2012
Location: Pensacola
Posts: 347
A dirty fuel filter will do that too. At idle it doesn't have the fuel demand like it does under a load so it would get enough thru the filter. As soon as you're on the gas, the filter can't keep up so it starts to cut out. I'd change that first since it's only about 10 bux vs 140.

Treat every situation like a dog. If you can't eat it or play with it pee on it and walk away.
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post #6 of 29 Old 07-23-2013, 05:21 AM
vadslram
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1990 YJ Wrangler 
 
Join Date: Jan 2006
Location: VA Beach
Posts: 6,042
sputters is kind of vague. It could be misfiring from ignition crossfire. Warmed up and under a little load crossfire would feel like a stutter.
Other than that I have no help.
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post #7 of 29 Old 07-23-2013, 02:14 PM
ladderslug
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2013 JK Wrangler 
 
Join Date: Feb 2013
Location: Jacksonville
Posts: 21
Quote:
Originally Posted by mdoddroe View Post
Specs
95 Jeep yj rio grande
2.5L 4cyl
80K miles
Auto Trans

Jeep sputters when driving... Occurs mostly at cruising speeds 40-65 mph but after engine is warm it occurs at all speeds. Doesn't occur in neutral, just when i'm giving it gas. Doesn't happen when engine is cold, so when I first get up it drives fine. This only occurs when engine is warm and it's intermittent. No codes at all other than defaults. Feels like it's not getting a constant stream of gas and it loses power going uphill.

What I've already replaced:
O2 sensor
Spark plugs
Coolant temp sensor
Fuel filter

Any suggestions?

I have a hint it's the fuel pump but just wanted to change out these cheap ones first
I have the same problem. I have changed the alternator, fuel filter, 02 sensor, and the person I bought it from changed the fuel filter but it whines load as a power steering pump that is low on fluid.

Mine also will not do it when not at temp. A mechanic friend said to take off the disconnect on my cables and clean them off to look like new, drive it to make sure no electrical deveations and if still does it replace the fuel pump and fuel filter ( even though I just replaced it), he also said to replace the sending unit for the gauge, mine is a 1/4 tank off.
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post #8 of 29 Old 07-23-2013, 02:23 PM
ladderslug
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2013 JK Wrangler 
 
Join Date: Feb 2013
Location: Jacksonville
Posts: 21
Quote:
Originally Posted by mdoddroe View Post
Specs
95 Jeep yj rio grande
2.5L 4cyl
80K miles
Auto Trans

Jeep sputters when driving... Occurs mostly at cruising speeds 40-65 mph but after engine is warm it occurs at all speeds. Doesn't occur in neutral, just when i'm giving it gas. Doesn't happen when engine is cold, so when I first get up it drives fine. This only occurs when engine is warm and it's intermittent. No codes at all other than defaults. Feels like it's not getting a constant stream of gas and it loses power going uphill.

What I've already replaced:
O2 sensor
Spark plugs
Coolant temp sensor
Fuel filter

Any suggestions?

I have a hint it's the fuel pump but just wanted to change out these cheap ones first
I have the same problem. I have changed the alternator, fuel filter, 02 sensor, and the person I bought it from changed the fuel filter but it whines load as a power steering pump that is low on fluid.

Mine also will not do it when not at temp. A mechanic friend said to take off the disconnect on my cables and clean them off to look like new, drive it to make sure no electrical deveations and if still does it replace the fuel pump and fuel filter ( even though I just replaced it), he also said to replace the sending unit for the gauge, mine is a 1/4 tank off.
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post #9 of 29 Old 07-23-2013, 02:34 PM
ladderslug
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2013 JK Wrangler 
 
Join Date: Feb 2013
Location: Jacksonville
Posts: 21
Quote:
Originally Posted by bigbossd1030 View Post
TPS? Mine would do something similar, didn't need a hill to loose the power on though. I found if I shut it off then back on it would be fine for about another 20 mins, but would happen again. The cel didn't come on for this for a good week or so. Then it came on so I ran the codes, got a 24 iirc. I am thinking that if it was the fuel pump, wouldn't it do it all the time, like regardless of temp???

Sent from my iPhone, probably because I am bored at work.
I was told the fuel pump will heat up and can change and loose presure
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post #10 of 29 Old 07-23-2013, 03:21 PM
bigbossd1030
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1995 YJ Wrangler 
 
Join Date: Feb 2010
Location: Edmonton, AB
Posts: 2,514
Quote:
Originally Posted by ladderslug

I was told the fuel pump will heat up and can change and loose presure
Ah that makes some sense.

Sent from my iPhone, probably because I am bored at work.

/l ,[____],
l----L-[]lllllll[]-
()_)-()_)--o)_)

OFFICIAL JEEPER
Any Jeepers in Edmonton, AB
I am on channel 33.

I live, I ride, I am JEEP.
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post #11 of 29 Old 07-23-2013, 03:31 PM
g_oneill
Registered User
1995 YJ Wrangler 
 
Join Date: Aug 2011
Location: Woodbury
Posts: 104
I have the occasional what my wife calls "putt-putt". Loss of power at different speeds on my 2.5. The problem goes away when I wiggle the wire on the 3rd injector. The problem was worst when I was driving long distances for a few hours straight and all the vibration that come along with 70 MPH. It came back a few times until I cleaned all the connections. That was one of the best cheapest fixes I ever did. Can't hurt to clean those connections. It has not come back all summer long, fingers crossed.
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post #12 of 29 Old 07-23-2013, 09:34 PM
slamb
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1991 YJ Wrangler 
 
Join Date: Aug 2012
Posts: 4
I had a similar problem on my '91 4.0. It was a bad catalytic converter. Once I replaced that, now runs like new.
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post #13 of 29 Old 07-24-2013, 05:26 AM
vadslram
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1990 YJ Wrangler 
 
Join Date: Jan 2006
Location: VA Beach
Posts: 6,042
Quote:
Originally Posted by ladderslug View Post
I was told the fuel pump will heat up and can change and loose presure
Isn't it an electric pump? they are cooled by the fuel flowing through them.
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post #14 of 29 Old 07-24-2013, 07:10 AM
clush
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1994 YJ Wrangler 
 
Join Date: Jul 2009
Location: Lexington
Posts: 255
Electrical parts tend to break down when they get hot if they are going bad. Pumps coils or whatever it may be
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post #15 of 29 Old 07-24-2013, 02:21 PM
FiremanDrew
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1993 YJ Wrangler 
 
Join Date: May 2013
Location: Hillsboro
Posts: 12
I just recently purchased my jeep and I was having the same problem. It turned out to be the fuel pump. I recommend replacing it.
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