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S197 race car running poorly when hot

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1
0
Exp. Type
W2W Racing
Exp. Level
20+ Years
Woodbine, MD
Hey All, I have a 2008 GT race car that runs great for the first 10-15 minutes than struggles to get above 4,000 RPM, it feels as if the car is starving for fuel like it wants to rev higher . Sometimes there is no CEL, other times it throws code 358; engine scan reveals no abnormalities. I have replaced all 8 coils, the injector on #8 cylinder, the throttle body, the fuel pressure sensor, the fuel pump, the fuel filter and all 8 spark plugs. The car is running headers with no cats.
I am at a loss, I was going to try engine wiring harness next and then ECU.
Anyone have similar experiences?
thx,
Ray
 

Dave_W

Cones - not just for ice cream
986
1,277
Exp. Type
Autocross
Exp. Level
20+ Years
Connecticut
Since you already replaced the coils, check the wiring to the coils. This page has some good diagnostic info. Wiggling the wires/connectors to the coils would be my first test.
 

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