microtuner and check engine light
Thread Starter
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Junior User
Joined: May 2003
Posts: 76
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microtuner and check engine light
I have a 1997 F-350 Powerstroke Crewcab with a straight pipe exhaust that has a down pipe and a micro tuner. My check engine light comes on under full power, with a code reading of turbo boost sensor A circuit high input. It came on every once in awhile before downpipe, now it comes on everytime. Micro tuner is great it makes a huge difference, but what is the deal with the check engine light????
Freshman User
Joined: Nov 2002
Posts: 40
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microtuner and check engine light
If I am not mistaken, the 97 has a flattened downpipe on them. This will restrict alot of airflow from the turbo. Check and see what you have, if this is the case, I would order a new downpipe before you burn up the turbo..
Hope this helps some..
Hope this helps some..
Thread Starter
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Junior User
Joined: May 2003
Posts: 76
Likes: 0
microtuner and check engine light
Yes I replaced the downpipe with a 3" round one. Now the check engine light comes on everytime I floor it for very long. Before the exhaust swap it only came on every now and then. With free flow exhaust it should lower pressure? My microtuner code reader is saying high boost pressure. Does anybody know how to cure the problem? Superchips wont help!
More Turbo
Joined: Mar 2002
Posts: 633
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From: Oregon USA
microtuner and check engine light
I get the same problem. wish I could figure it out.
and its not over boosting. only hits 17-18
do you have a boost guage popkorn? if so how did you hook it up? I think that might be part of the problem.
and its not over boosting. only hits 17-18
do you have a boost guage popkorn? if so how did you hook it up? I think that might be part of the problem.
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Junior User
Joined: May 2003
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microtuner and check engine light
No gauges yet. I was told you really can't over boost a diesel 30 or 40lbs? I know a guy that runs 30lbs with no problem. That is with propane,chip,and 4" exhaust. Wouldnt think microtuner is over boosting? I wonder if I can buy higher pressure sensor?
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Posting Guru
Joined: Feb 2003
Posts: 2,153
Likes: 1
From: Roseburg OR.
microtuner and check engine light
Hey Andy,
Check this out.
https://www.ford-trucks.com/forums/s...hreadid=117107
Might be the hot ticket
Check this out.
https://www.ford-trucks.com/forums/s...hreadid=117107
Might be the hot ticket
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Brett Foote
Posting Guru
Joined: Feb 2003
Posts: 2,153
Likes: 1
From: Roseburg OR.
microtuner and check engine light
Here ya go 'Drew,
You have two options for controlling the SES light for 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.
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.
