evl55
ls1 misfiring when warm
ok, problem that i have had for a couple of weeks now and its driving me nuts. when car is cold it runs beautiful, but once warm it runs very rough, surges etc, only under about 2000rpm, when it does it, to accelerate it hesitates a little then goes great. once at revs or full throttle its fine. i have changed leads, fuel filter, injectors, coolant temp, cleaned tb, checked for vac leaks, still no go. no codes are being thrown either. the car is vy ss, 6 speed, 230/230 112 comp cam, otr and mafless tune. twin 2.5 exhaust. any help please????
Blumpkin
uhmm fuel regulator?? air filter, dirty TB, IAC? uhmm trying to think....foo-foo valve? lol
Originally Posted by Swordsy
evl55
pulled tb off yesterday and cleaned the whole lot including iac and tps. air filter is clean as. foo-foo valve... hmm could be onto something there haha
O.G.
take it to a tuner and get them to stick it on a dyno and see what going on. see what's happening in closed loop mode, check AFRs, stuff like that.
Had a similar problem and turned out that it was the O2 sensors, and they were not throwing any codes either.
02 sensors ... mine did put out a code . had the same problem
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