[MR2] <MKIIT> Running rich/ cold-start injector question

[Donald Chalfant]

 All turbos run rich. I guess the question is "how rich is yours running"? 
The backfiring (I'm presuming you are talking about popping and banging upon 
letting off the throttle?) could be caused by one of more injectors not 
seating good and leaking fuel. The ECU is supposed to impose a fuel cut when 
the throttle is closed if the rpm is over _I think_ 1500 rpm. This could 
account for what looks like excessively rich mixtures and 
bang/pop/bang/boom.  If you do have a leaking injector, cold starting will 
take additional cranking to get the fuel pressure built up.

Although, both my turbos do this when the rpm gets down to about 16-1700 rpm 
and the turbine wheel/primary cat is warmed up good. I do have G-Force ECUs 
and straight through exhausts which probably helps the noise propagation. 
(yeah!)

Find a garage with a good exhaust gas analyzer and check the mixture. This 
is the only way we can tell if you're overly rich


> Hi all,
>
> So, my new turbo runs quite rich, to the point of back-firing from time to
> time. I have run codes and consulted the book. I haven't really started to
> work the issue and have a question about troubleshooting the cold-start
> injector. Is there ANY way to check/remove without removing the throttle
> body. That first step in removing it - "Drain Coolant" - really bothers 
> me.
> I would really like to avoid the work that entails, but more so, the work
> that refilling it entails. If anyone has any input on that, please let me
> know. I know, it could probably use new coolant anyway, so if there are no
> options, I'll likely do that. >sigh<
>
> Also, the car has a JDM ECU. What are the advantages to this? Could this 
> be
> the cause of the rich condition?
>
> AND: I need some parts that may not be available from the dealer (Aaron,
> please let me know if they are). Immediately, I would like to get my hands
> on: the lens for the door light on the driver's side, the entire assembly 
> of
> the plastic parts for the frunk, including the piece that goes over the
> radiator (with clips would be really helpful), finally, I would like to 
> get
> the upholster lining for the trunk, with clips. Give me some prices and
> shipping so that I can run it through my finance department. :)
>
> Thanks!!
>
> -- 
> Sincerely,
> Kevin Parker
>><>
>                "Look, these people, they have no jobs, no food, no
> education, no future. I just figure that we have two things we can do. 
> Help,
> or we can sit back and watch a country destroy itself on CNN. "
>                 -SSG Eversmann, Task Force Ranger
>                  "Blackhawk Down"
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