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Idels good.wont go over 30 mph.trans wants to downshift.

Customer Question
Idels good.wont go over...

Idels good.wont go over 30 mph.trans wants to downshift.

Mechanic's Assistant: What is the model/year of your Chevy?

1991 topkick 366 gas

Mechanic's Assistant: Has the vehicle turned into a gas hog? And how does it start -- same as usual?

Starts good

Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far?

Just purchased.will fuel filter cause this.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Thought it was a trans problem.heard itcould be low fuel pressure.

Submitted: 8 months ago.Category: Transmissions
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Answered in 20 hours by:
12/12/2017
Transmission Mechanic: Pete, Automotive Mechanic replied 8 months ago
Pete
Pete, Automotive Mechanic
Category: Transmissions
Satisfied Customers: 33,398
Experience: GM and Mercedes vehicle technician.17 years experience.
Verified

My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.

Low fuel pressure from a weak fuel pump or restricted fuel filter will cause this issue.If you have a PTO if the PTO is engaged it will also cause this and needs disengaged.Another cause is a restriction in the exhaust like a restricted catalytic converter needing replaced.

All of these need to be checked into to then locate and repair this fault here.

If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service, your 5-star rating is appreciated ( should be a link to click on here or above).You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.

Thanks Pete

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Pete, Automotive Mechanic
Category: Transmissions
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Experience: GM and Mercedes vehicle technician.17 years experience.

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