Slight hestitation from dead stop
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Which engine? I had that issue with my 05 Super V8 which has the 4.2SC engine. No codes either. 66,000 miles at the time. Cleaned the throttle body. The problem went away. I should have checked fuel trims @ the time but had peeked at my TB previously and noticed the butterfly valve stuck ever so slightly (barely noticeable).
It would help if you tell us which model and year - mileage also.
But I'd follow JagV8's suggestion and start with the fuel trims.
It would help if you tell us which model and year - mileage also.
But I'd follow JagV8's suggestion and start with the fuel trims.
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Turns out it solved my issue but many things can cause that ever so slight hesitation on a cold engine.
Fuel trims aren't to tough to learn about and can easily be read with the torque app. Without codes, they're a great way to steer you.
Anyway, you car, your rules and cleaning the TB and butterfly won't hurt if done right. I'm just leveling expectations.
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You didn't mention if this is a new problem or how long has it been happening or if it's been this way for a while. How much hesitation do you have. If you floor it from a dead stop what does it do.
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It will shift at red line. Perhaps you weren't quite there yet?
Not sure why the transmission would start to "slip/click".
With an open differential of a 4.2XKR you'd likely be burning just one tire in that situation.
It does seem the hesitation was the traction control?
The DSC is harsh when it cuts power.
It took time with it off to develop a good sense of where crossing the line of grip would be in given situations.
Then with it on and a better understanding of the balance of the car I'm able to not trigger it as harshly anymore.
Not sure why the transmission would start to "slip/click".
With an open differential of a 4.2XKR you'd likely be burning just one tire in that situation.
It does seem the hesitation was the traction control?
The DSC is harsh when it cuts power.
It took time with it off to develop a good sense of where crossing the line of grip would be in given situations.
Then with it on and a better understanding of the balance of the car I'm able to not trigger it as harshly anymore.
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Carbon build up on back of throttle body valve will cause the hesitation and flat spot right off idle. Remove and spray it down with carb cleaner. Let it dry well before reinstalling it. It doubt you have a MAF issue. Most modern cars have a MAF cleaning cycle and during this cycle the deposits on the sensor wire are burnt off. It is not recommended by the MAF manufacturers to clean the sensors. If the MAF is bad, you will get a code. If you have the MAF code, throw it away and buy a new one
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hawaiianjag
XK8 / XKR ( X100 )
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11-30-2012 06:24 PM
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