service engine light......overboost !!!
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Joined: Apr 2003
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service engine light......overboost !!!
Hi wondering what the best most popular way to not have the SES (ServiceEngineSoon) LIGHT to come on with a MAP sensor code, BECAUSE OF OVERBOOST !!! I am running a micro tuner on the 80 HP setting on an early 99 powerstroke... Saw this on E-bay would this be the trick...thanks Frank
http://cgi.ebay.com/ebaymotors/ws/eB...tem=2414535323
http://cgi.ebay.com/ebaymotors/ws/eB...tem=2414535323
Senior User
Joined: Feb 2003
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From: Somewhere out there.
service engine light......overboost !!!
I beleive that is a preset parameter in your pcm. Mine did that, the lamp was on for about 5 seconds then went out. It turns on at about 25 psi of boost. I don't think that can be changed, if it could I would think that the issue would have been adressed in the chip/programmer.
Last edited by psd tech; May 8, 2003 at 09:46 AM.
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
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From: Cabot, Arkansas
service engine light......overboost !!!
You have two options for controlling the SES light for overboost.
1. 4.7 v Zener diode. The overboost light is set at approximately 24psi, which is a 5 volt imput signal to the MAP sensor. The diode installs in the map sensor wire and shunts off anything over 4.7 volts, thereby eliminating the ses light.
The downside is it might affect other sensors, but none that I ever noticed, and some have reported (including myself) that the diode can slightly limit top end performance by failing to stop limiting the signal when it drops below 4.7v
Total cost for the ZD, less than one dollar.
2. The other option is to install a mechanical limiting device such as a pop off valve or a regulator (Like the one in the posted link) These devices install into the air line to the MAP sensor and prevent the SES light by limiting the actual boost the MAP sensor recieves.
Costs around $20-40 depending on whether you buy one from a dealer, or piece it together yourself.
1. 4.7 v Zener diode. The overboost light is set at approximately 24psi, which is a 5 volt imput signal to the MAP sensor. The diode installs in the map sensor wire and shunts off anything over 4.7 volts, thereby eliminating the ses light.
The downside is it might affect other sensors, but none that I ever noticed, and some have reported (including myself) that the diode can slightly limit top end performance by failing to stop limiting the signal when it drops below 4.7v
Total cost for the ZD, less than one dollar.
2. The other option is to install a mechanical limiting device such as a pop off valve or a regulator (Like the one in the posted link) These devices install into the air line to the MAP sensor and prevent the SES light by limiting the actual boost the MAP sensor recieves.
Costs around $20-40 depending on whether you buy one from a dealer, or piece it together yourself.
Posting Guru
Joined: Mar 2003
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service engine light......overboost !!!
Well I hate to shoot your theory but I run about 32 lbs of boost (not all the time and mine only comes on with a full throttle 1/4 mile run. But I can hit it on the freeway and run it up to around thirty with no problems.
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
service engine light......overboost !!!
Well I hate to shoot your theory
These devices install into the air line to the MAP sensor and prevent the SES light by limiting the actual boost the MAP sensor recieves.
Last edited by cookie88; May 9, 2003 at 11:49 AM.
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