Evo ix, fail safe? (limp mode?)
Aug 19, 2009, 04:27 PM
#1
Evolving Member
Thread Starter
Evo ix, fail safe? (limp mode?)
EVO IX
26,000
Injen hard pipe intake W/ K&N AF
Perrin turbo back exh (test pipe)
stock map
stock O2's
looks stock otherwise
act's sort of like it's in fail safe, won't rev over 1500 on accel and will go to 4,000 if you blip the throttle in nuetral but then drops back to 1500 if you hold it WOT (in nuetral). Sounds just like a rev limit bounce but at 1500.
customer says it happened suddenly just driving on freeway.
no MFI codes (readiness tests not complete?)
all data list looks normal, O2's, short and long fuel trim, MAP, VAF, inj, timing, TPS
coils firing ok (timing light), injectors seem to be clicking ok, cam timing ok,
plugs very sooty rich, cleaned, no difference.
fuel sample ok, fuel pressure ok
pulled the BOV and capped BOV holes, no difference.
26,000
Injen hard pipe intake W/ K&N AF
Perrin turbo back exh (test pipe)
stock map
stock O2's
looks stock otherwise
act's sort of like it's in fail safe, won't rev over 1500 on accel and will go to 4,000 if you blip the throttle in nuetral but then drops back to 1500 if you hold it WOT (in nuetral). Sounds just like a rev limit bounce but at 1500.
customer says it happened suddenly just driving on freeway.
no MFI codes (readiness tests not complete?)
all data list looks normal, O2's, short and long fuel trim, MAP, VAF, inj, timing, TPS
coils firing ok (timing light), injectors seem to be clicking ok, cam timing ok,
plugs very sooty rich, cleaned, no difference.
fuel sample ok, fuel pressure ok
pulled the BOV and capped BOV holes, no difference.
Aug 19, 2009, 04:31 PM
#2
EVO IX
26,000
Injen hard pipe intake W/ K&N AF
Perrin turbo back exh (test pipe)
stock map
stock O2's
looks stock otherwise
act's sort of like it's in fail safe, won't rev over 1500 on accel and will go to 4,000 if you blip the throttle in nuetral but then drops back to 1500 if you hold it WOT (in nuetral). Sounds just like a rev limit bounce but at 1500.
customer says it happened suddenly just driving on freeway.
no MFI codes (readiness tests not complete?)
all data list looks normal, O2's, short and long fuel trim, MAP, VAF, inj, timing, TPS
coils firing ok (timing light), injectors seem to be clicking ok, cam timing ok,
plugs very sooty rich, cleaned, no difference.
fuel sample ok, fuel pressure ok
pulled the BOV and capped BOV holes, no difference.
26,000
Injen hard pipe intake W/ K&N AF
Perrin turbo back exh (test pipe)
stock map
stock O2's
looks stock otherwise
act's sort of like it's in fail safe, won't rev over 1500 on accel and will go to 4,000 if you blip the throttle in nuetral but then drops back to 1500 if you hold it WOT (in nuetral). Sounds just like a rev limit bounce but at 1500.
customer says it happened suddenly just driving on freeway.
no MFI codes (readiness tests not complete?)
all data list looks normal, O2's, short and long fuel trim, MAP, VAF, inj, timing, TPS
coils firing ok (timing light), injectors seem to be clicking ok, cam timing ok,
plugs very sooty rich, cleaned, no difference.
fuel sample ok, fuel pressure ok
pulled the BOV and capped BOV holes, no difference.
Good luck scoping the problem
Aug 19, 2009, 05:38 PM
#3
Evolving Member
Thread Starter
Yeah, Mitsu calls a MAF a VAF, and the readings looked normal. When the BOV was off you could feel pressure build. There's no boost gauge, maybe should hook one up.
Aug 20, 2009, 10:18 AM
#5
Evolving Member
Thread Starter
Aug 20, 2009, 11:49 AM
#6
Evolving Member
Thread Starter
When the MAF is disconnected seems to run a little better, like it's in a failsafe with a 2800 rpm limit and it doesn't stutter to get there.
starting to think bad ECU also, pulled it and the board looks okay, no burn spots
starting to think bad ECU also, pulled it and the board looks okay, no burn spots
Aug 20, 2009, 12:19 PM
#7
Registered User
time for speed density? 
could be a few problems, i think u have highlighted most. recheck ur fuses and electrical grounding.
a local evo VII had a similar problem, the car would not rev part 3000rpm. this was due to bad gas.
could be a few problems, i think u have highlighted most. recheck ur fuses and electrical grounding.
a local evo VII had a similar problem, the car would not rev part 3000rpm. this was due to bad gas.
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Aug 20, 2009, 03:57 PM
#9
Evolving Member
Thread Starter
I would do speed density if I could but Mitsu might not buy it
tried ECU reset, no difference
Sep 30, 2009, 09:53 AM
#10
Evolving Member
Thread Starter
feeling sort of silly
it was the intercooler ducting hose came loose at the intercooler inlet. The only connection you couldn't see without moving the splash shield. There was 2 of us working on it, that's my excuse.
it was the intercooler ducting hose came loose at the intercooler inlet. The only connection you couldn't see without moving the splash shield. There was 2 of us working on it, that's my excuse.
Jun 9, 2011, 11:22 PM
#11
damn i hope thats my issue. after doing a few log pulls i got a loud pop noise thought it was fuel/boost cut. then the car runs like car had to do like 10 mph home. AFR all over the place and cant rev the car and while im moving if i try to give gas its like i hit a brick wall and car almost wants to die.
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