p0171-174
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Joined: Feb 2012
Posts: 9
From: NORTH EAST OHIO
Don't I already have MPFI? Reference voltage and resistance on IAT seem to be good. I can't even find the ECT. My book says it's near impossible to get to. Yesterday I had over an hour of normal use before it started to screw up. I thought I had it whipped. Is there a way to lock it in open loop? Everything is fine in open loop.
Last edited by rod45; Mar 22, 2012 at 12:24 PM.
BF Veteran
Joined: May 2011
Posts: 2,257
From: SW Central OH
Don't I already have MPFI? Reference voltage and resistance on IAT seem to be good. I can't even find the ECT. My book says it's near impossible to get to. Yesterday I had over an hour of normal use before it started to screw up. I thought I had it whipped. Is there a way to lock it in open loop? Everything is fine in open loop.
Sure there is.. put in a resistor in place of ect to make VCM always think it's in warmup. of course your gas mileage tanks.
Here's the approp VCM conn with ect. You can measure there.
Ooops. no 5v on that conn. Find 5v pin on the iat or whatever and ohm from that to pin 23
Last edited by pettyfog; Mar 22, 2012 at 12:51 PM.
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New Member
Joined: Feb 2012
Posts: 9
From: NORTH EAST OHIO
Thanks fellow Buckeye. I've decided to bite the bullet and spend $50 on a diagnostic next Tuesday. They told me it takes 2-5 hrs to do. Maybe it will come back with something simple. What ever, I'll let you know.
Bit the bullet and had a diagnostic run and it came back "low fuel pressure". Said we only had 48psi running, so we are going to try another regulator since the pressure before was 80psi. I hope this does it.
Bit the bullet and had a diagnostic run and it came back "low fuel pressure". Said we only had 48psi running, so we are going to try another regulator since the pressure before was 80psi. I hope this does it.
Last edited by rod45; Apr 3, 2012 at 08:09 AM.
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