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Engine hesitant when under load


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Hi all,

I've searched and seen similar issues come up for the Evora but nothing in here. Over the last week the car has been hesitant under normal acceleration where it has stalled twice on me and low revs, also when cruising at 2,000 rpm the car will sit happily then jerk for a few seconds then sit happily before jerking again. I decided to give it a good boot to see if it needed a clear through and while doing this the TC light came on and stayed on, I pulled over turned the car off and restarted, which cleared the TC light and all was normal again. The next day and the Idle seemed low and rough at around 750 rpm from cold with air temps of 8°c and back to jerky response under acceleration or at constant rpm.

Just for background, I use my car as a daily pretty much and has a CAI fitted so hasn't been sat around, the air filter is clean and dry.

I have removed the MAF and cleaned it and the plug with electrical cleaner ,and also the plug on the clutch position sensor.

Anyone else suffered this with an Exige and what else could be the culprit?

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@JackandCokeseems crazy doesnt it?!  Here's the thing, the brake sensor cuts throttle signal when it thinks you are trying to slow the car.  It is a very sensitive item that can easily be tuned by those with the skill and tools/tech. 

So, in simple terms, if your accelerator is erratic or inconsistent, then it is possible that your foot pressure is being ignored and even curtailed when the brake sensor tells the ecu that your plan is to slow not speed.

It was a very good suggestion and one to check.

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3 minutes ago, Jcx said:

@JackandCokeseems crazy doesnt it?!  Here's the thing, the brake sensor cuts throttle signal when it thinks you are trying to slow the car.  It is a very sensitive item that can easily be tuned by those with the skill and tools/tech. 

So, in simple terms, if your accelerator is erratic or inconsistent, then it is possible that your foot pressure is being ignored and even curtailed when the brake sensor tells the ecu that your plan is to slow not speed.

It was a very good suggestion and one to check.

So no standing burnouts allowed then?

Thank you, and Pete for the suggestion then. I'll have a check now and see if I can come up with anything conclusive with the switch. 

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CAI surely.

The MAF is super sensitive to non laminar airflow and under sudden or specific loads the air might be turbulent enough that it can’t derive a correct reading for the amount of air passing.

It could also be a leak in the related pipe work between MAF and supercharger, which would be an easier fix.

Edited by trcm
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So its the CAI. I checked the above and all values looked ok, I reset the ECU by pulling the power and and the car has been ok since.

The CAI has been on the car for 6 months so I'll have to see if the 'bad values' return or not in the future

Thanks all for the help!

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