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  1. #1441
    Join Date
    Oct 2017
    Location
    Oxford
    Posts
    1,215
    Thanks everyone.

    I have been chasing a few gremlins the last couple of weeks. Now the engine has a couple of hundred miles on it I have started to stretch it a bit. When doing so I discovered a misfire/hesitation starting at 4000rpm.

    First port of call was fuel. The fuel pump was pretty noisy. So I decided to fit a surge pot and a low pressure pump to feed the pot. I did this all at the back of the car. After this was complete test drives showed that the hesitation had moved from 4K rpm up to nearly 5k rpm.

    After some head scratching I turned my attention to the 123 ignition. I spent some time googling and managed to find the Rover factory advance curve and MAP curve, so I loaded these onto the system and tested again, no improvement.

    I then turned my attention to the FiTech injection system. I plugged on the handheld controller and found a fault code of “RPM noise”. Googling showed me that this is fairly common. I checked my spark plugs and they were a non resistor style of plug. I changed these to a similar spark plug with resistor properties. I also checked my IAC settings on the FiTech and these were way off, so I adjusted this as well. I also changed the HT leads to some 8mm high performance silicone leads. I also added a direct earth cable from the FiTech onto the battery earth strap on the engine. The final adjustment was to alter the fuel pump settings under hard acceleration.

    After getting though that lot a test drive tonight for half an hour or so had me hit the Rev limiter a couple of times with a good clean pull through the revs and no hesitation.

    When I got back home I plugged my handheld controller back on the FiTech and checked for error messages and there were none, so the rpm noise issue has been solved.

    Hopefully that’s sorted it for good and I can get on with ragging it to death now
    Last edited by KugaWestie; 07-05-21 at 08:09 PM.
    Classic Replica Viper IVA passed 25th March 2021, Sold September 2021.
    TVR Chimaera restoration project in progress

  2. #1442
    Join Date
    Mar 2009
    Location
    liverpool
    Age
    48
    Posts
    633
    Sounds like a good day 👍

  3. #1443
    Join Date
    May 2004
    Location
    Cowbridge, United Kingdom
    Age
    64
    Posts
    10,413
    Well done chap!
    I'm surprised you didn't have resistive plugs already.
    Kev Davies
    South Wales Area Rep. UKCC Membership Secretary
    DAX Mk4, 383 Chevy Stroker, Tremec. SOLD
    Contemporary CCX 3-4028, 445ci Big Block FORD FE,TKO 600, Old School IVA'd and SOLD
    Dax De Dion LS2 and T56 IVA'd June '17 SOLD
    1965 Ford Mustang 289 Convertible SOLD
    In build- Hawk 289 Sebring Awaiting IVA

  4. #1444
    Join Date
    Oct 2017
    Location
    Oxford
    Posts
    1,215
    Quote Originally Posted by kdavies3 View Post
    Well done chap!
    I'm surprised you didn't have resistive plugs already.
    Yeah to be honest I was surprised as well when I took one out for a look. I must have had a moment when I bought them originally!!
    Classic Replica Viper IVA passed 25th March 2021, Sold September 2021.
    TVR Chimaera restoration project in progress

  5. #1445
    Join Date
    Oct 2017
    Location
    Oxford
    Posts
    1,215
    Sun is shining, so I drove the car to work today, Rude not to really!

    Classic Replica Viper IVA passed 25th March 2021, Sold September 2021.
    TVR Chimaera restoration project in progress

  6. #1446
    Join Date
    Aug 2007
    Location
    Bournemouth
    Posts
    733
    Mine will hopefully becoming to work with me sometime next week.
    Looking good. Nice job.
    David.

    Life is driving the Cobra. The rest of the time is just waiting................till I fix it!

    Wessex region caretaker rep.

  7. #1447
    Join Date
    Oct 2017
    Location
    Oxford
    Posts
    1,215
    So with the Cobra now sold, it’s time to introduce the next project. This time a restoration

    Classic Replica Viper IVA passed 25th March 2021, Sold September 2021.
    TVR Chimaera restoration project in progress

  8. #1448
    Join Date
    May 2016
    Location
    Cheshire
    Age
    53
    Posts
    452
    Should keep you out of trouble over the winter..
    ~~~~~~
    Sumo Mk3

  9. #1449
    Join Date
    May 2004
    Location
    Cowbridge, United Kingdom
    Age
    64
    Posts
    10,413
    Well done Gary.
    Is it a 5.0l V8?
    Kev Davies
    South Wales Area Rep. UKCC Membership Secretary
    DAX Mk4, 383 Chevy Stroker, Tremec. SOLD
    Contemporary CCX 3-4028, 445ci Big Block FORD FE,TKO 600, Old School IVA'd and SOLD
    Dax De Dion LS2 and T56 IVA'd June '17 SOLD
    1965 Ford Mustang 289 Convertible SOLD
    In build- Hawk 289 Sebring Awaiting IVA

  10. #1450
    Join Date
    Aug 2007
    Location
    Bournemouth
    Posts
    733
    If I didn’t have the Dax, I would have one of these.
    David.

    Life is driving the Cobra. The rest of the time is just waiting................till I fix it!

    Wessex region caretaker rep.

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