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Old 13-06-2019, 05:33 PM
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Default Flat spot 02 Patrol

Hi All,
I have a flat spot in my 02 ZD30 DDTi in 3rd sometimes 4th under load going up a hill and would appreciate some technical advise as to what may be the problem and possible cures. I have just changed oil & filter, Both fuel filters and new lift pump (top section only), air cleaner and replaced MAF sensor with new. Engine was rebuilt 10,000 kms ago. Car is running great, just this flat spot driving me crazy, I'm at the end of my fault finding tether. Cheers.
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Old 13-06-2019, 07:43 PM
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How long is a piece of string....well in the length of that string could be a list of any possible faults LOL..

Could be the TPS on the throttle pedal,they can play up and cause a flat spot.
Could be something as simple as the fuel filter getting blocked.
It could be the injector pump as recently i have become a lot more educated about them as my own packed up.In the pump itself are a lot of components which directly effect the timing so if any of these were to start getting wore out it could cause this symtom too.

I would be focusing on all the small things first. It might only be the ECU cutting down the boost to manage the air/fuel in certain driving conditions.

First,remove the Intercooler and when refitting make 100percent sure all clamps and hoses are spot on and really tight...any loss of boost from here can play up too. While you were in there it would be a great idea to do a throttle body clean out if you never done one!! Can only improve drivability.
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Old 14-06-2019, 11:54 AM
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Yes, my next step is going to be the TPS as said in post both fuel filters changed and inter cooler and pipes and throttle body are clean and tight.
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Old 15-06-2019, 03:05 PM
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Any recommendations for replacement TPS, ebay etc, what to look out for ??

Cheers.
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Old Yesterday, 10:15 AM
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Just change it is the only way to know if it cures the problem.

To be fair the TPS is either going or they arn't but they can act up and cause flat spots but the most common failure is a 'No start'
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