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Old 10-31-2013, 10:32 AM   #1
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Help with IAT sensor

Have recently put on a 90mm MAF, it requires and external IAT sensor. I have a K&N CAI and a professional products intake manifold that was done by the previous owner. I believe what he did was somehow made the IAT sensor go into the intake manifold instead of the MAF. I am now showing a check engine light because of the new MAF does have a sensor built in like the stock one does. Does anyone have any suggestions????
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Old 10-31-2013, 04:44 PM   #2
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Running n/a the stock 80 mm MAF is good to 325+ HP at the wheels. What engine mods do you have that require the 90 mm unit?

You realise you will need a new tune to properly use that MAF, right?
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Old 10-31-2013, 05:43 PM   #3
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Quote:
Originally Posted by cliffyk View Post
Running n/a the stock 80 mm MAF is good to 325+ HP at the wheels. What engine mods do you have that require the 90 mm unit? You realise you will need a new tune to properly use that MAF, right?
Don't have anything that really "requires" the 90mm, just wanted to add it. Yes I do realize that it requires a tune, I have already changed my tune to allow for it. So do you have insight as to how I can fix my problem??
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Old 10-31-2013, 06:02 PM   #4
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Quote:
Originally Posted by shawn.velez36 View Post
Don't have anything that really "requires" the 90mm, just wanted to add it. Yes I do realize that it requires a tune, I have already changed my tune to allow for it. So do you have insight as to how I can fix my problem??
Get an IAT sensor from an earlier 2V; 1999 to 2001, get it from a junk yard if possible so you can also get the connector and wiring; mount it in a hole in the intake tube--many CAI setups have a pre-marked or plugged hole for just that.

Connect the gray/red and gray wires from the separate IAT sensor to the gray/red and gray wires in positions 1 and 6 of the MAF connector.

FWIW the engine will run more smoothly and pull more strongly with the 80 mm MAF, as you will be using 75+% of it's metering range--as opposed to 55% or less of the 90 mm unit's range...
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Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 10-31-2013, 06:24 PM   #5
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Quote:
Originally Posted by cliffyk View Post
Get an IAT sensor from an earlier 2V; 1999 to 2001, get it from a junk yard if possible so you can also get the connector and wiring; mount it in a hole in the intake tube--many CAI setups have a pre-marked or plugged hole for just that. Connect the gray/red and gray wires from the separate IAT sensor to the gray/red and gray wires in positions 1 and 6 of the MAF connector. FWIW the engine will run more smoothly and pull more strongly with the 80 mm MAF, as you will be using 75+% of it's metering range--as opposed to 55% or less of the 90 mm unit's range...
Thanks for the advice, I appreciate it
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Old 11-06-2013, 07:43 PM   #6
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Well, I went and put my new tune on today. Somehow it cleared my check engine light and I went to check the DTC code and there was nothing there!! I guess they probably do some kind of override that tell the computer that it doesn't need it. HOORAY!! NO MORE CHECK ENGINE LIGHT
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Old 11-06-2013, 08:43 PM   #7
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Originally Posted by shawn.velez36 View Post
Well, I went and put my new tune on today. Somehow it cleared my check engine light and I went to check the DTC code and there was nothing there!! I guess they probably do some kind of override that tell the computer that it doesn't need it. HOORAY!! NO MORE CHECK ENGINE LIGHT
Jk it came back on!!! :,,,,(
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Old 12-04-2013, 08:58 PM   #8
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Alright I finally got the right harness for it. I think I have it connected right but I'm still getting the check engine light and when I check the code it's saying that the IAT sensor circuit is high. Anyone know what this means?? Anyone have any suggestions as to what I should do next??
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