Stutter in gear
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Joined: Mar 2023
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From: Fox lake, Illinois
Stutter in gear
Hello everyone I was hoping someone could help me and my ranger. This truck has been my daily for 6 years and reliable as hell and I just replaced the neutral safety switch. Now it has a shudder in gear but clears up once pulled back out? I can give it gas and the truck will move but it just isn’t making sence to me. Has a check engine while in gear but doesn’t once pulled out? Koeo test is clear and truck won’t connect to do a koer test. I attached two videos of the truck doing its episode. Thank you to anyone for any help. 🙂
Welcome to the forum
1989 2.9l manual trans?
Reads like misfires, you don't really feel these until engine is under a load, i.e. moving under engine power
When were the spark plugs and wires last changed?
Spark plug/wires can be OK with idle fuel mix but then misfire when air/fuel mix is RICH, i.e. when accelerating in gear, stumbling
Most common issue on these is the TFI module, as they get older they tend to cause misfires after warm up(or cold) and slow/no starts after being shut off and then warm restarts in hot weather
If you have a timing light test each spark plug wire after engine is warmed up make sure it has a steady pulse at idle, just watch the strobe should be no missed beats, if missing beats replace TFI module
And check spark timing, warmed up engine, SPOUT disconnected should be 10-12deg BTDC, SPOUT connected, 20-22deg BTDC
Dirty injector tips, run a can of Seafoam, or similar injector cleaner, in the gas tank, see if it helps after 1/2 tank or so, if it gets better add another can on the next tank full
I do one can a year on my 1994 4.0l, makes a difference
1989 2.9l manual trans?
Reads like misfires, you don't really feel these until engine is under a load, i.e. moving under engine power
When were the spark plugs and wires last changed?
Spark plug/wires can be OK with idle fuel mix but then misfire when air/fuel mix is RICH, i.e. when accelerating in gear, stumbling
Most common issue on these is the TFI module, as they get older they tend to cause misfires after warm up(or cold) and slow/no starts after being shut off and then warm restarts in hot weather
If you have a timing light test each spark plug wire after engine is warmed up make sure it has a steady pulse at idle, just watch the strobe should be no missed beats, if missing beats replace TFI module
And check spark timing, warmed up engine, SPOUT disconnected should be 10-12deg BTDC, SPOUT connected, 20-22deg BTDC
Dirty injector tips, run a can of Seafoam, or similar injector cleaner, in the gas tank, see if it helps after 1/2 tank or so, if it gets better add another can on the next tank full
I do one can a year on my 1994 4.0l, makes a difference
Thread Starter
|
Member
Joined: Mar 2023
Posts: 2
Likes: 0
From: Fox lake, Illinois
Welcome to the forum
1989 2.9l manual trans?
Reads like misfires, you don't really feel these until engine is under a load, i.e. moving under engine power
When were the spark plugs and wires last changed?
Spark plug/wires can be OK with idle fuel mix but then misfire when air/fuel mix is RICH, i.e. when accelerating in gear, stumbling
Most common issue on these is the TFI module, as they get older they tend to cause misfires after warm up(or cold) and slow/no starts after being shut off and then warm restarts in hot weather
If you have a timing light test each spark plug wire after engine is warmed up make sure it has a steady pulse at idle, just watch the strobe should be no missed beats, if missing beats replace TFI module
And check spark timing, warmed up engine, SPOUT disconnected should be 10-12deg BTDC, SPOUT connected, 20-22deg BTDC
Dirty injector tips, run a can of Seafoam, or similar injector cleaner, in the gas tank, see if it helps after 1/2 tank or so, if it gets better add another can on the next tank full
I do one can a year on my 1994 4.0l, makes a difference
1989 2.9l manual trans?
Reads like misfires, you don't really feel these until engine is under a load, i.e. moving under engine power
When were the spark plugs and wires last changed?
Spark plug/wires can be OK with idle fuel mix but then misfire when air/fuel mix is RICH, i.e. when accelerating in gear, stumbling
Most common issue on these is the TFI module, as they get older they tend to cause misfires after warm up(or cold) and slow/no starts after being shut off and then warm restarts in hot weather
If you have a timing light test each spark plug wire after engine is warmed up make sure it has a steady pulse at idle, just watch the strobe should be no missed beats, if missing beats replace TFI module
And check spark timing, warmed up engine, SPOUT disconnected should be 10-12deg BTDC, SPOUT connected, 20-22deg BTDC
Dirty injector tips, run a can of Seafoam, or similar injector cleaner, in the gas tank, see if it helps after 1/2 tank or so, if it gets better add another can on the next tank full
I do one can a year on my 1994 4.0l, makes a difference
It just recently happened after the safety switch went out and I’ve replaced it with motorcraft like all the other sensors. It also has the same issue when the brakes are touched but there’s all new vacuum lines and new booster and master cylinder
Last edited by Ranger1989v65speed; Mar 4, 2023 at 05:23 PM.
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