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Thread: No Power

  1. #1

    No Power

    Advice sought from all.

    US 49 Noble M12R GTO, original owner. Original build was by Gregg Robb and since, it has spent time with Hoover. The car has ECU tuned by Hoover, Turbohoses Hard Pipes and BOV with Turbohoses exhaust. It has around 30K miles, around 10K miles on engine 2 as first engine developed piston slap and was replaced. It has been used as a good weather daily driver and HPDE track car. At the track, it was running great, typical Noble when it started to develop a miss and then black flagged for fluids. Pulled over and opened up the clamshell and fluids turned out to be antifreeze. Car was allowed to cool off and put back into the hauler. Turned out there was a small hole in the hose between the engine and radiator where a cable was rubbing (Drop the bottom pan and make sure the hoses are aligned appropriately) and the loss of fluid caused overheat and the fluids were antifreeze.

    The hose was replaced and everything seemed fine. Oil was changed and no evidence of antifreeze in the oil. Car runs fine in 1 and 2 but as soons as a load is put on the car, 3rd gear, the engine starts to sputter and miss with no power around 3000 RPM. There is no boost in 3rd gear and boost in first 2 gears is low although the car feels strong. When the engine is cold, you can get it up to 70 mph on the highway in 6th gear as long as you don't come on boost and stay below 3000 RPM but as the engine gets warmer, it starts to sputter.

    1 Fuel pressure was falling at higher RPM. Fuel pump was replaced and filters were changed (Pump is no longer so loud). Coarse filter between tank and pump with fine filter between pump and engine. Apparently the Bosch 044 pump doesn't like to suck but blows against pressure well
    2 Injectors pulled and sent to RC Engineering, 2 injectors were clogged with poor spray patterns
    3 Igniters were replaced with Accel injectors
    4 Exhaust was pulled to make sure there was no obstruction, all of the packing in the catalytic converters was gone so no obstruction
    5. ECU was checked, no codes and the adaptive maps were reset using Version 1.3 of the diagnostic software
    6. Compression and leak down performed with cold engine - Normal

    Results: Car idles smoothly, no intermittent miss as was present in the past. Still no power. What to do? ? Warped head or valve issue which can't handle boost / load and gets worse as the engine warms up? Any ideas about potential issue would be appreciated.

    Options: 1 Get the current engine fixed
    2 Replace the engine with another AER engine
    3 Replace the engine with a long block built motor
    4 K24 Swap
    5 V8 Swap
    6 Sell the car as a rolling chassis? Value?

    Open to all of the above and would appreciate input. Obviously trying to contain costs.

  2. #2
    Quote Originally Posted by jorligan View Post
    Results: Car idles smoothly, no intermittent miss as was present in the past. Still no power. What to do? ? Warped head or valve issue which can't handle boost / load and gets worse as the engine warms up? Any ideas about potential issue would be appreciated.
    Shooting from the hip, but... may want to check vacuum hoses, cracked turbo manifolds, or cracked intake plenum.
    Granted, the cracked turbo manifolds won't cause sputter, but could cause degraded performance.

    Options:

    6 Sell the car as a rolling chassis?
    1 Get the current engine fixed ($500-$4000, tough to say)
    2 Replace the engine with another AER engine ($3000+)
    3 Replace the engine with a long block built motor ($5000+)
    4 K24 Swap ($15k+)
    5 V8 Swap ($30k+)

    Open to all of the above and would appreciate input. Obviously trying to contain costs.
    I've rearranged your above from cheapest to most expensive and added estimated costs. Selling the car doesn't cost anything, per se, so that's why it's on top.


    Also, you'll get more responses on NobleForums.com, as this forum is pretty quiet.

  3. #3
    Join Date
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    are you getting boost?
    check the wastegate actuator and make sure the c-clip didn't come off and make sure that the wastegate aren't leaking.
    Last edited by Hoover; 04-28-17 at 08:20 AM.
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    Noble M12/M400
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