XK / XKR ( X150 ) 2006 - 2014

Slight hestitation from dead stop

 
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Old 05-10-2019, 07:48 PM
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Default Slight hestitation from dead stop

Just when I punch it, a little bit better response when cold . No problem passing or getting on it from speed just from a dead stop
No codes runs great otherwise
 
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Old 05-10-2019, 10:25 PM
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Maybe check the fuel filter straight off. Clean up the MAF sensors maybe?
 
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Old 05-12-2019, 12:53 PM
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Have a look t the fuel trims in case they're out.
 
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Old 05-12-2019, 05:06 PM
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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.
 
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Old 05-12-2019, 05:17 PM
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4.2 sc , trims are more than I can do, when I have a chance I plan to do a throttle body body clean.
 
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Old 05-12-2019, 05:35 PM
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Originally Posted by Canadacat View Post
4.2 sc , trims are more than I can do, when I have a chance I plan to do a throttle body body clean.
OK but bear in mind, I happened upon the sticky butterfly valve. I was inspecting the TB, not trying to solve the hesitation at the time.

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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Old 05-12-2019, 05:39 PM
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Appreciate all the help I do have torque pro , just upgraded today trying to figure out to see the trims. I
 
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Old 05-12-2019, 07:38 PM
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Originally Posted by Canadacat View Post
Appreciate all the help I do have torque pro , just upgraded today trying to figure out to see the trims. I
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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Old 05-12-2019, 07:44 PM
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Only owned for two months, I just about think it's a tps issue but that should be be an issue at all speeds, leaning to throttle body
 
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Old 05-12-2019, 07:47 PM
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Originally Posted by Canadacat View Post
Only owned for two months, I just about think it's a tps issue but that should be be an issue at all speeds, leaning to throttle body
OK so did the car feel this way when you got it. Try accelerating full throttle from a dead stop and what do you feel.
 
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Old 05-12-2019, 07:54 PM
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When I bought the car it was cold and would break the tires cc easily so I really don't know. It will still break traction but it's like for an instance at the beginning it hesitates. Maybe that is the case nature of the 4.2, I will get into it.
 
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Old 05-12-2019, 09:57 PM
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I'm curious, is this with traction control disabled?

The TC will make a cut if it slips.
 
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Old 05-13-2019, 06:24 AM
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I'm with Cee Jay on this one give the maf sensor a cold clean they can get gunked up after a good decade
 
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Old 05-13-2019, 07:16 AM
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Thanks for replys , i will look into the throttle body and maf when I get time.
 
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Old 05-14-2019, 08:58 PM
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Well today I take it out and take the DSC off and it rips the rubber off my tires to the extent that it was way over rpms and transmission started to slip/click ,why didn't it up shift at some point?
 
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Old 05-15-2019, 07:15 AM
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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.
 
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Old 05-15-2019, 03:37 PM
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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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