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What is code 127 - 1997 Mercury Grand Marquis

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PO127---- Intake air temperature sensor "A" circuit.

Posted on Sep 23, 2010


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What should the psi compression be thanks.

It can vary between make and model of car. However, a general rule of thumb is that 135+ average is okay. Less than 85psi is pointing at something seriously amiss in the engine.

It can vary - some cars may have 125psi as 'average' compression.

Don't expect each cylinder to give the same compression reading as there will be a fluctuation. Another general rule of thumb is that there shouldn't be more than 10% variation between the readings. That is, if cylinder No1 is 135 psi, cylinder No2 shouldn't be less than '125 ish'.

If you suspect you may have compression issues, it's quite easy to do a bit of fault finding. Warm the engine first so that the pistons are expanded in the cylinders. Then do a dry compression (normal) test.

Here's some examples of compression tests on a 4 cylinder engine:
130 127 129 127

All compression readings are within 10% of each other. Fine.

Example 2:
95 95 129 127
Here, a low compression reading on cylinder 1 and 2 suggests a problem. It may be due to a faulty head gasket/cylinder head allowing compressed gases to be transferred via the defective head gasket from one cylinder to another.

Example 3:
130 80 129 127
Cylinder No2 has a problem. It's compression is way down. The other three cylinders are fine. So .. what is the cause of the low compression on cylinder 2? It could be a broken ring/cracked piston or a burnt exhaust valve.

This is where you do a second compression test - called the 'wet' test.

Squirt some light engine oil into each cylinder. Aim for the cylinder walls so that the oil can find its way down the walls and around the piston rings. Place a rag over each spark plug hole and spin the engine to expel excess oil.

The oil that you have sprayed into each cylinder will form a 'seal' around the piston ring. Do another compression test and note down the readings. Here's example 3 again:
Example 3:
130 80 129 127
.. with the low compression on cylinder 2.

If after carrying out the 'wet' compression test you have a reading along the lines of
130 100 129 127
suggests that the bore/piston rings in cylinder 2 are at fault. The compression has increased on No2 cylinder because of the oil forming a seal around the rings.

If there is no increase in psi on the wet test i.e
130 80 129 127
This suggests a burnt exhaust valve.

May 17, 2016 | Cars & Trucks

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I have 2003 dodge neon se odometer code says po 127 I need no what need to do want start or roll over but all lights work

code p0127 refers to intake air temperature (IAT) sensor---too high==causes--wiring short to ground--IAT sensor 2--mechanical fault---ECM

Mar 13, 2015 | Dodge Cars & Trucks

1 Answer

My 2010 honda odyssey beeps twice after I lock it and also when I unlocke it, I would like it not to. How can I fix it?

lost the operators guide, most cars cover this, to beep or not to beep
some cars even honk the dang horn, (ill kill those silent)
its here. the manual

its even search-able.
page 103 and page 127, the 127 page shows what to do. for sure.
get the manual and put it on flash stick, avoid being stranded.
lots of hints i the guide to avoid that.... lots.

Oct 31, 2013 | 2010 Honda Odyssey

1 Answer

I have a 2003 Ford Ranger 2.3l 5 speed. My truck codes P2004 witch is IMRC stuck open. I checked rhe vaccum lines and the electrical connection and they were fine. The only thing left to do is change the...

are the little plastic bushings still intact on the irmc linkage? the only thing about leaving alone is the light will stay on and you may not have the torque needed if passing or pulling or hauling a load.

Aug 14, 2011 | 2002 Ford Ranger Regular Cab

1 Answer

Can not locate the fuses for the power windows

Check position 33, 5AMP...


also in the Taurus Owners Manual (page 127 and next).

Hope help wit this (remember rated this help).

May 13, 2010 | 2000 Ford Taurus

1 Answer


i'd start with a complete tune up. plugs, wires, pcv valve, gas and air filter. what engine code are you getting? normally vehicles 1996 and newer get a obd (computer) emissions test not an asm (tail pipe) test. and perhaps a new catylitic converter and oxygen sensors

Apr 17, 2010 | 1997 Cadillac DeVille

1 Answer

I have the following codes come up: , 285

The light just went out on its own and hasn't came back on for three or four days and counting.

Nov 30, 2009 | 2006 Dodge Ram 1500

1 Answer

Code for a tv remote

Here are some Universal Remote codes for Daewoo TVs:

GE Universal Remote: 0130 0004 0009 0100 0005 0138 0043 0140 0039 0252 0279 0444 0080 0042 0058 0017 0010 0126 0018 0127 0019.
Philips Universal Remote: 0614 0002 0502 0611 0102 0415 0905 0615 0505 0826 0529 0046 0609 0805 0407 0303 0602 0214 0403 0314 0503.
One For All Universal Remote: 0451 1661 0092 0672 0623.
RCA Universal Remote: 1004 1005 1006 1016 1017 1082 1171 1190.
Innovage Universal Remote:004 005 009 017 018 019 042 058 082 085 097 100 126 127 130 138.
Verizon FiOS TV remote 0478 0119 1688 0650 0688 0699.

Feb 13, 2009 | 1999 Daewoo Nubira

1 Answer

I need the crank timing 0n a1980 124 I dont have my boon

Check out: Autodata and Haynes Manuals websites. You should be able to down the information you want. I am sure you will be able to purchase a manual for your 127.

Jul 25, 2008 | Fiat 124 Cars & Trucks

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