WOT and High RPM interesting issue
#1
WOT and High RPM interesting issue
Hey all,
While road racing, I find I lose power at WOT (100% throttle) and above 5500 RPM with a slight miss. However, if I let off on the gas just a bit (but still in PE mode), then the car seems to gain the power back and lose the slight miss. Further, this issue seems to be a hot issue. Meaning it happens when the car sees a coolant temp above 210 F.
Not sure what could be causing this. Give me some leads.
Thanks,
Ben
While road racing, I find I lose power at WOT (100% throttle) and above 5500 RPM with a slight miss. However, if I let off on the gas just a bit (but still in PE mode), then the car seems to gain the power back and lose the slight miss. Further, this issue seems to be a hot issue. Meaning it happens when the car sees a coolant temp above 210 F.
Not sure what could be causing this. Give me some leads.
Thanks,
Ben
#4
No codes. Opti has about 250 miles on it. Granted, high rpm miles. I want to rule everything else out before I go this route again.
BTW, everything is new from battery to plugs: battery, PCM, ICM, coil, plug wires, plugs. OK, plugs have 1K miles on them. Alternator was just rebuilt and have not had a chance to test this item. They said the brushes were worn.
BTW, everything is new from battery to plugs: battery, PCM, ICM, coil, plug wires, plugs. OK, plugs have 1K miles on them. Alternator was just rebuilt and have not had a chance to test this item. They said the brushes were worn.
#5
I have not checked pressure because my datalogs show smooth O2 all the way to limit. I know this is not a perfect indicator but I would think there would at least be a 30-50 mV drop at the end if pressure was bad. Thankfully, I CAN check the pressure and so may if this continues. Good idea.
I have not considered valve float because when the car is lower than 200 F and I rev to limit, the car is glass-smooth. Would valve float come into play when I just let off the gas and keep the same RPM but now the car smooths out?
Thanks,
Ben
#7
#8
Well brand new plug wires with heat shields and one is burnt! I think I found my issue.
A note: Summit Racing's plugs did not hold up to heat at all. With a shield, they did not last as long as my others that were unshielded. Rubber became soft.
A note: Summit Racing's plugs did not hold up to heat at all. With a shield, they did not last as long as my others that were unshielded. Rubber became soft.
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10-31-2016 11:09 AM