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Input and output speed sensor symptoms?

Customer Question
Input and output speed sensor symptoms?
Submitted: 5 years ago.Category: Chrysler
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Answered in 4 minutes by:
4/3/2012
Chrysler Mechanic: Amedee, Chrysler Technician replied 5 years ago
Amedee
Amedee, Chrysler Technician
Category: Chrysler
Satisfied Customers: 27,089
Experience: ASE certified Technician advanced level specialist. Wisconsin certified emissions state inspector
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Hello!

Are you saying that the engine has a hard start at times? Does this happen intermittently? Cold hot or does this happen all of the time?

Are you saying that it will not rev up past 2500 rpms in drive or even in park?
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Customer reply replied 5 years ago
Hard start every time. Will not rev past 2500 in either situation, drive or park. I'm out options, from what I've read and researched the input and output speed sensors may have a factor in this situation. Please help
Chrysler Mechanic: Amedee, Chrysler Technician replied 5 years ago
Are you talking about the transmission input and output speed sensors?

Have you checked fuel pressure?
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Customer reply replied 5 years ago
Yes the trans input and output sensors. Yes I have checked the fuel pressure and it is at spec, 58 psi from what I recall...
Chrysler Mechanic: Amedee, Chrysler Technician replied 5 years ago
Ok.. got it.

Have you checked engine vacuum at idle and when trying to rev up the engine?
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Customer reply replied 5 years ago
No I haven't done that. Would that affect the rpm issue?
Chrysler Mechanic: Amedee, Chrysler Technician replied 5 years ago
Sort of...

What ever it causing this engine to run like this would most likely cause the engine vacuum to be lower than normal. You could have a plugged converter or the valve timing could be off. You might want to check for a plugged cat and engine vacuum/engine compression to see if you get low readings. If so, you might want to check the timing marks. The timing belt could have jumped a few teeth or it could even be loose. Both will cause the engine vacuum to be low and instable. It should be well above 19 inches of vacuum at idle.
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Customer reply replied 5 years ago
I thought of the timing issue and was thinking of checking that next, but once the rpm's hit 2500 it's like it hits a rev limiter and cuts out. I don't think a timing issue or a plugged converter or cat would do that. I know the cats are clear. Correct me if I am wrong...
Customer reply replied 5 years ago
And the vacuum is strong
Chrysler Mechanic: Amedee, Chrysler Technician replied 5 years ago
HOw much engine vacuum does it have at idle?
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Customer reply replied 5 years ago
I wish I could tell you, but I don't recall the exact reading. That was one of the first few things I checked months ago... The only thing I remember was that it was at or just above spec
Chrysler Mechanic: Amedee, Chrysler Technician replied 5 years ago
Ok.. double check the reading at idle and at 2500 rpm when the engine is acting like it is at the rev limiter. We need to see how well the engine is breathing.

Also, don't forget to check engine compression and the timing marks if needed.

I hope this helps! Please don't forget hit the green accept button so that I may get credit for the time that I have spent with you. This is necessary for me to be paid for my work and get credit for assisting you. Your question will not close, and you will still have the opportunity to follow-up if needed. Leaving a bonus and positive feedback is not required, but doing so is certainly appreciated!

I do hope you are as honest with me about your vehicle as I have been with you. If you have any further questions or if you need more assistance, just hit the reply button and we can continue our conversation. Please remember, even if you accept my answer now, you can still reply or respond back to this thread at any time you wish at no further cost to you.

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Thanks in advance!

Best Regards

AMEDEE
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Customer reply replied 5 years ago
Before I do anything I'd like to know about the trans input and output sensors as this was my original question...
Chrysler Mechanic: Amedee, Chrysler Technician replied 5 years ago
The transmission input and output speed sensors will not affect the engine running.
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Customer reply replied 5 years ago
Last question, there is a pigtail connector coming off of the tps harness that is a 3 prong connector to a sensor somewhere in the back of the motor that isn't connected to anything but had to have been at one time recently. What would the connector possibly go to?
Chrysler Mechanic: Amedee, Chrysler Technician replied 5 years ago
There are lots of sensors. I would need to see a picture of this connector or you would need to tall me the color wires that go to this connector for me to point you in the right direction.
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Customer reply replied 5 years ago
It is a 2 wire connector, both wires black, one with a red stripe and the other with a blue stripe
Chrysler Mechanic: Amedee, Chrysler Technician replied 5 years ago
It sounds like either the engine coolant temp sensor connector or the air intake temp sensor connector.
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Customer reply replied 5 years ago
You are right about the IAT. Is that supposed to be on the intake tube just before the throttle body? I have an intake tube from another motore from the junk yard but it was a little short and didn't have any sensors or sensor locations on it making me believe it's the wrong part
Chrysler Mechanic: Amedee, Chrysler Technician replied 5 years ago
YES.. the intake temp sensor is located on the intake. SOme are on the intake snorkel and some are on the intake manifold itself.
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Customer reply replied 5 years ago
Missing that sensor would cause stalling and starting issues, correct?
Chrysler Mechanic: Amedee, Chrysler Technician replied 5 years ago
YES.. it could!
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Customer reply replied 5 years ago
It didnt work. I have a feeling the timing is off
Chrysler Mechanic: Amedee, Chrysler Technician replied 5 years ago
I would agree!
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Amedee
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