[MR2] 91T low idle issues - Resolved

Sat Sep 6 12:16:15 EDT 2008

Hey guys, I figured it out.... It was the Iridium plugs.. The non iridium piece of the plug eroded away quite a bit causing the gap to be extremely out of spec. On the highway I was having issues when trying to boost over 5psi. The car would go but I would feel some hesitation. I pulled the plugs and replaced them with a set of slightly used splitfires I had saved when I was going through spark plug trials. Engine ran smoother with the splitfires then with the standard NGKs.

Its been a while since I bought the iridium plugs but they are not the stock temp range. They are a step hotter or colder... Dont recall. 

This concerns me because I have iridium plugs in the 350Z and they are not easy to get to. I have to remove a piece of cooling line and lots of other little things to get to them. So thats a 1.5 hour job if I take my time and do it right.

Thanks,

Steven 

91t - thats happy now

----- Original Message ----
From: Donald Chalfant <dkchal at datasync.com>
To: STEVEN M HAUSHERR <hausherrs at sbcglobal.net>; Joseph Obernberger <joelori at earthlink.net>
Cc: mr2 at mr2.com
Sent: Sunday, August 31, 2008 8:01:47 PM
Subject: Re: [MR2] 91T low idle issues

A stock engine at idle should show 20-21" of vacuum.  The more cam overlap 
you have, the less vacuum you'll show and then signal from the ECU will be 
skewed. I'm not sure if you can diddle with the Air Bypass Valve to get more 
air in or not.  If your vacuum at 3000 is not at least 10" you might have a 
gross leak on the engine side of the throttle.
----- Original Message ----- 
From: "STEVEN M HAUSHERR" <hausherrs at sbcglobal.net>
To: "Donald Chalfant" <dkchal at datasync.com>; "Joseph Obernberger" 
<joelori at earthlink.net>
Cc: <mr2 at mr2.com>
Sent: Friday, August 29, 2008 9:17 AM
Subject: Re: [MR2] 91T low idle issues

I have a greddy profec specII that shows vacuum. I dont know how accurate 
that is. Dont have an analog gauge. What would I be looking for?

----- Original Message ----
From: Donald Chalfant <dkchal at datasync.com>
To: STEVEN M HAUSHERR <hausherrs at sbcglobal.net>; Joseph Obernberger 
<joelori at earthlink.net>
Cc: mr2 at mr2.com
Sent: Thursday, August 28, 2008 7:36:00 PM
Subject: Re: [MR2] 91T low idle issues

I'm thinking that the overlap of the cams might be more than the stock ECU
can handle. Although there are purportedly experts on the list who could
tell you from past experience. Do you have a vacuum gauge reading at idle,
with AC on (~ 1000 rpm), 3000 rpm?
----- Original Message ----- 
From: "STEVEN M HAUSHERR" <hausherrs at sbcglobal.net>
To: "Joseph Obernberger" <joelori at earthlink.net>
Cc: <mr2 at mr2.com>
Sent: Thursday, August 28, 2008 1:16 PM
Subject: Re: [MR2] 91T low idle issues

> Stock cam gears, HKS Cam gears are still on the shelf. I think I am just
> going to sell them if anyone is interested. They are new. I plan to drive
> the car a lot more now and dont really think I am going to be doing any
> more mods. Stock ECU. I have suspected that i need to re-shim the head but
> just have not gotten to it. The valve train is really noisy. I had the
> head rebuilt at a local head shop. The shop installed the ferrea valves,
> cams, and shimmed it. I checked the gaps prior to installing the head and
> a lot of the valves were at the top of the acceptable range. After the
> head has been run for a while I am sure that its possible that those gaps
> have fallen out of spec.
>
> Thanks,
>
> Steven
>
>
>
> ----- Original Message ----
> From: Joseph Obernberger <joelori at earthlink.net>
> To: STEVEN M HAUSHERR <hausherrs at sbcglobal.net>
> Cc: mr2 at mr2.com
> Sent: Thursday, August 28, 2008 12:26:50 PM
> Subject: Re: [MR2] 91T low idle issues
>
> Are you using the stock cam gears? Stock ECU?
> I would check the valve clearance.
>
> Joe
> http://www.lovehorsepower.com
>
> STEVEN M HAUSHERR wrote:
>> Hi everyone.
>>
>> My 91T idles at about 500rpm almost to the point of stalling. However
>> when the A/C is on and/or when the car is cold it idles at 900 or so.
>> Which is fine, and means that the idle-up is working. But why would it
>> idle at 500 when warm and no accessories running?
>>
>> I recently had a new engine put in. HKS 262 cams and 8.3:1 pistons were
>> installed. This issue did not exist prior to the new engine. I suspect
>> that with the new cams and pistons I have to adjust the air bypass on the
>> TB? Other then the idle issue it runs strong, no other noticeable issues.
>>
>> Thanks in advance,
>>
>> Steven
>> _______________________________________________
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>> MR2 at mr2.com
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>>
>>
>>
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