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Its pre detonating at 4000rpm quite violently & holding

Customer Question
Its pre detonating at...

Its pre detonating at 4000rpm quite violently & holding gears in economy n sports mod while at the same time struggling to increasing road speed the trans also hangs on to 1st n 2nd n having to lift the throttle to iniciate a

Mechanic's Assistant: How many miles are on the car? Have you noticed any fluid leaks lately?

131,000 kms - fluid leaks replaced water pp due to leaking at tell tail, some weaping of eng oil around front harmonic balancer seal, Eng oil n filters fuel n air changed as part of service

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

2001 Cougar Hi Aldo - have Ford Couger Oct 2001 Vin WFOHT61L615101521 Chase spark plugs x 6 Can

Mechanic's Assistant: What year is your Ford?

2001

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

When owner arrived he was complaining that while heading sth on Fwy Eng struggling to maintain 80km/hr in 100km/hr zone - he told me just put $20 of 98 fuel bringing fuel gauge to 1/4 I a few days later put 20 more in to bring just over 1/2 tank not a lot of change in performance

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

Electric fuel pp not yet removed from tank for inspection, not yet check fuel press, Auto trans oil n filter plan to change tomorrow

Submitted: 8 months ago.Category: Australia Car
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Answered in 1 day by:
11/11/2017
AU Auto Mechanic: sprinkles08, ASE Certified Technician replied 8 months ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: Australia Car
Satisfied Customers: 24,063
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
Verified

Hello and welcome to JustAnswer! I apologize for the extended wait time you experienced, I've only just come online now and would like to assist you with your question.

There are quite a few things that could be going on but I would first suspect either low fuel pressure or an exhaust restriction based on what you have described.

Have you checked for fault codes?
Have had a chance yet to check fuel pressure under load while the problem is happening?

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