Very Bad Surge/ Hesitation/ Stumble @ 2,200 Rpm
Discussion
Difficult to describe this fault exactly , but shes almost undriveable at the moment .
At approx 2,200 rpm, through to aprox 3,000 rpm, She appears to completely lose power, hold back, surge , lose power etc. As soon as 3,000 rpm is reached it's fine. It's as if the ignition key is being rapidly turned on and off again and again.
This problem seems to come and go, it started again recently after turning left at a set of lights. ime wondering if it's the Fuel Filter, thats clogged up , or the Pump, but why does it clear @ 3,000 ? when the engine needs more fuel . Hissys MX5 has a similar problem.
Got a strong petrol smell I'n the boot as well. Any ideas much appreciated!!
At approx 2,200 rpm, through to aprox 3,000 rpm, She appears to completely lose power, hold back, surge , lose power etc. As soon as 3,000 rpm is reached it's fine. It's as if the ignition key is being rapidly turned on and off again and again.
This problem seems to come and go, it started again recently after turning left at a set of lights. ime wondering if it's the Fuel Filter, thats clogged up , or the Pump, but why does it clear @ 3,000 ? when the engine needs more fuel . Hissys MX5 has a similar problem.
Got a strong petrol smell I'n the boot as well. Any ideas much appreciated!!
very hard to track down & I didn't use a fault code reader to find that one 
about that 
Hi All / OP - First post for a (very) long time under a long since lost different login.
I've experienced very similar symptoms myself this year. In my case, the cutting / violent surging happened repeatedly at 2600 rpm. Condition deteriorated rapidly from initially only happening after driving on full throttle to happening every time 2600 rpm was exceeded; made the car undrivable and unsafe. There have been some other posts around this topic recently which have suggested disconnecting AFM / ECU and resetting. For me, this had no effect and the problem remained, nor did the fitment of a new coil. Solution was a combination of problems that were the T'Pot and ECU - diagnosed and "cured" (items replaced) during a Mark Adams mapping session on my 500 at TVR Power.
As T'pot has already been mentioned as a candidate, you will find, like other electrical components they are available at a variety of price points; Mark Adams uses Land Rover ones...... good enough for me.
John
I've experienced very similar symptoms myself this year. In my case, the cutting / violent surging happened repeatedly at 2600 rpm. Condition deteriorated rapidly from initially only happening after driving on full throttle to happening every time 2600 rpm was exceeded; made the car undrivable and unsafe. There have been some other posts around this topic recently which have suggested disconnecting AFM / ECU and resetting. For me, this had no effect and the problem remained, nor did the fitment of a new coil. Solution was a combination of problems that were the T'Pot and ECU - diagnosed and "cured" (items replaced) during a Mark Adams mapping session on my 500 at TVR Power.
As T'pot has already been mentioned as a candidate, you will find, like other electrical components they are available at a variety of price points; Mark Adams uses Land Rover ones...... good enough for me.
John
Sounds exactly the problem I had which turned out to be a knackered AFM. I'm told you can run without the AFM connected so pull the multi-plug & go for a test drive.
Good Luck
Also see thread :
http://www.pistonheads.co.uk/gassing/topic.asp?h=0...
Good Luck
Also see thread :
http://www.pistonheads.co.uk/gassing/topic.asp?h=0...
Edited by ESDavey on Tuesday 6th September 08:01
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