Engine stumble
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Elder User
Joined: Jan 2008
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From: Gatineau, Quebec
Engine stumble
Hey all...I posted this in the 92-96 forum but thought i would also post it here...hoping for some thoughts.
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I have a question about what I believe you call engine stumble. The engine runs fine and no problems really, but at idle....it is not exactly smooth. It has what I suspect folks here call engine stumble. It just seems to skip a beat so to speak every few seconds. I am not sure if the timing between the skips is exactly the same each time...but it is consistent in that it does it always. I don't think it use to do it, but not sure really when it started. It has been doing it for awhile now though(month or two?). The engine in question is the 4.9 in my 94. The cap/rotor & wires are about a year old and the plugs are new. I am thinking it is an ignition problem, but am no expert. I have not pulled any codes recently, but will shortly.
I would like to address this problem soon, so I thought I would ask here to get some ideas before I start throwing parts at it.
Could it be a bad fuel injector(s)
......
I have a question about what I believe you call engine stumble. The engine runs fine and no problems really, but at idle....it is not exactly smooth. It has what I suspect folks here call engine stumble. It just seems to skip a beat so to speak every few seconds. I am not sure if the timing between the skips is exactly the same each time...but it is consistent in that it does it always. I don't think it use to do it, but not sure really when it started. It has been doing it for awhile now though(month or two?). The engine in question is the 4.9 in my 94. The cap/rotor & wires are about a year old and the plugs are new. I am thinking it is an ignition problem, but am no expert. I have not pulled any codes recently, but will shortly.
I would like to address this problem soon, so I thought I would ask here to get some ideas before I start throwing parts at it.
Could it be a bad fuel injector(s)
Thread Starter
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Elder User
Joined: Jan 2008
Posts: 973
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From: Gatineau, Quebec
ok...codes are as follows
koeo codes......116, 636 & 114
CM codes are 332, 334 & 628
I am going to look these up now, but wanted to post them here first, since some already likely know what they mean.
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koeo codes......116, 636 & 114
CM codes are 332, 334 & 628
I am going to look these up now, but wanted to post them here first, since some already likely know what they mean.
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Joined: Dec 2006
Posts: 3,603
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From: Spokane, WA
Probably would more likely be called a "miss". A "stumble" is usually associated with moving the throttle and getting a "hesitation" or stumble" before the engine takes off. Quite often a symptom of a problem with an accelerator pump on a carbed vehicle.
Since you have the codes pulled you are well on the way to resolving the issue.
Since you have the codes pulled you are well on the way to resolving the issue.
Thread Starter
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Elder User
Joined: Jan 2008
Posts: 973
Likes: 0
From: Gatineau, Quebec
Probably would more likely be called a "miss". A "stumble" is usually associated with moving the throttle and getting a "hesitation" or stumble" before the engine takes off. Quite often a symptom of a problem with an accelerator pump on a carbed vehicle.
Since you have the codes pulled you are well on the way to resolving the issue.
Since you have the codes pulled you are well on the way to resolving the issue.
I later warmed up the engine which then gave me a 1-1-1
system pass on the first set
The Continuous Memory codes remained but in addition, I got another code of 326 which is also egr related
--(Pressure Feedback EGR shows low pressure EGR not seating or not seating intermittently ).
I could not loosen the sleeve bolt that hold the tube onto the egr...so I've put some lubricant on it and will try again tomorrow. I initially was simply going to replace it until I found out what they are worth(insert a few profane syllables here). I will therefore try to clean the egr first, as I've been let to believe that this is an option. If that fails then I will replace. I suspect that will clear up all but the tranny code.
The tranny issue will be addressed as soon as it warms up a little.
