[Diy_efi] Misfire

Sat Sep 23 13:34:03 UTC 2006

Another thought would be something in the throttle pump menu going awry, or
something with cold start enrichment or idle control speed (if your using
IAC) i had funky things happen with both of mine...  I ended up enabling the
zero throttle map and unplugging the IAC servo til i could figure out what
was going on -- car ran so good like that i never bothered fixing it...

My logic is that if its revving way up like that it's got to have some sort
of logic mismatch for the amount of air thats coming in, and also has to be
trying to compensate for the idle because it gradually comes back down...
You re-calibrated the haltech for the new MAP sensor right?  i know mine
only takes a 3 bar but its an older unit...

As far as the oil having a gas smell, those ECM's can usually do either a
'fuel cut' or 'spark cut' for 'RPM MANAGEMENT' ...  if it over-revs it'll
cut either the spark or the fuel -- most turbo cars its safer to cut the
spark and go rich than have it cut your spark at higher boost and melt a
hole in your piston -- sounds as if you should take a look for that and flop
it.  Either way, it's revving way up and it sounds like its trying to limit
the RPM travel --  again, if you've got IAC just use your zero throttle map
and disable the IAC totally (unplug the servo) and disable in the haltech.
that'll use whatever your current throttle plate offset is (if you have to
move the set pin be sure to re-calibrate your TPS).

Which brings me up on that one.  Check your TPS by watching the engine data
screen with the haltech software 'online' but without the engine running.
gradually run the throttle up and down and see if it's a nice smooth
movement.  If it's not, sounds like your accellerator pumps (throttle pump)
settings are off..

Let me know how you make out...

On 9/22/06, Mike Yates <tmc_mike_yates at sbcglobal.net> wrote:
>
> On Fri, 22 Sep 2006 14:43:26 -0700, you wrote:
>
> >what is the gap on the plugs and what boost are you running? also have
> you checked leak down to figure out if you have a blow-by problem? this may
> cause fouling.
>
> Mike
> >
> >On Fri, 22 Sep 2006 14:01:26 -0700 (PDT), you wrote:
> >
> >>Hi,
> >>
> >>  New to the list...
> >>
> >>  I have an Haltech E11v2 working with my VG30DETT on 5bar map sensor.
> Everything was fine until recently it developped strange problem. It's been
> frustrating trying to find it. I hope someone can give me some pointers.
> >>
> >>  When the car is idling, the TPS can not be opened over 40%. And if I
> open the throttle slowly, the engine will go up to about 5500-6000rpm. In
> both cases, from that point the AFR will shoot up to more than 20:1. And the
> motor oil has the gas smell. It is almost like the spark was blowing out
> during those two conditions.
> >>
> >>  I first thought it's the TPS. I replace it with 2 used ones, no help
> and TPS calbration seems to be fine. I cleaned the CAS, TPS and temp sensor
> connectors, the fuel pressure is good, the ignition coils are good and fire
> good sparks when I cranked the car, the intake and exhaust system have no
> clogs, the rpm signal is good when the problem occurs. When I remove the CAS
> and rotate the CAS shaft manually, the injectors click and the spark plugs
> fire. I also check there is no leaks from the injectors.
> >>
> >>  It's driving me nuts. What else could it be? Thanks in advance!
> >>
> >>
> >>---------------------------------
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-- 
Sincerely,
Lee M. Lemoine
KB1NQI  - Amateur Radio
http://www.turbochargedsoul.com/
'06 Subaru Legacy GT Limited - 250/250 AWD 5EAT
'93 Chevy Cavalier Z24 Convertible - 300/330 FWD 5MT (Mclaren Turbo!)