Check engine light

[FakTorThis]

We were trying to see whats wrong with my 1997 Grand Marquis today. So my uncle got his code scanner and after we changed the spark plugs and wires that code cleared but now theres a new one (1408) he said its something with the EGR System or ERG I don't remember what it was he said exactly but he said to ask what it could be on this website because he said even though he works on cars he tries to avoid working on fords because he doesnt like to work on them so he doesnt really know what could be wrong.

[BlackIce]

Try this out for size:




Ford is known for problems with their DPFE sensors. These sensors detect the change in manifold vacuum pressure when the EGR is commanded on and off. If you get an EGR code, DO NOT automatically assume that it’s a bad EGR valve! Get a hand held vacuum pump and apply vacuum to the EGR. Check the operation of the valve. It if moves properly and the passages are clean, move on to checking the DPFE sensor. Use the same hand held vacuum pump to apply pressure to the sensor. Check for a change in voltage as you do this. If the voltages are within spec, move on to clear up this very common blockage.

Remove the throttle body and gasket. Behind the gasket you will find a half moon shaped passage with 3 openings into the intake manifold. Most likely you will discover that the passages are clogged with carbon buildup. Clean out the passages with a small pick and some throttle body cleaner. Then, install a new gasket and the throttle body. Your problem should be gone.

This problem is common on the 2.5, 3.0 Duratec, and the 4.6 liter engines.
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[imorb1994]

Try this out for size:



Quote:
<TABLE cellSpacing=0 cellPadding=6 width="100%" border=0><TBODY><TR><TD class=alt2 style="BORDER-RIGHT: 1px inset; BORDER-TOP: 1px inset; BORDER-LEFT: 1px inset; BORDER-BOTTOM: 1px inset">Originally Posted by http://free-auto-repair-advice.blogspot.com/2007/08/ford-egr-codes-p0401-p1408fix-clogged.html

Ford is known for problems with their DPFE sensors. These sensors detect the change in manifold vacuum pressure when the EGR is commanded on and off. If you get an EGR code, DO NOT automatically assume that it’s a bad EGR valve! Get a hand held vacuum pump and apply vacuum to the EGR. Check the operation of the valve. It if moves properly and the passages are clean, move on to checking the DPFE sensor. Use the same hand held vacuum pump to apply pressure to the sensor. Check for a change in voltage as you do this. If the voltages are within spec, move on to clear up this very common blockage.

Remove the throttle body and gasket. Behind the gasket you will find a half moon shaped passage with 3 openings into the intake manifold. Most likely you will discover that the passages are clogged with carbon buildup. Clean out the passages with a small pick and some throttle body cleaner. Then, install a new gasket and the throttle body. Your problem should be gone.

This problem is common on the 2.5, 3.0 Duratec, and the 4.6 liter engines.
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+1 had the same code and problem on my 95 Crown Vic twice

[whd507]

iowa like much of the midwest got a few shots of oxygenated fuel this year. that fuel will cause corrosion in the OEM diaphram style DPFE sensor. newer and cal/noreast cars have a different DPFE sensor tolerant of this fuel. WELLS has recently developed a better tolerant sensor and that style seems to be working better. the GM way is much worse, as it is built into the $150 EGR valve. most DPFE sensors are in the $20-30 range.

[FakTorThis]

Ok guys thanks for the help we'll try that tomorrow

[whd507]

its far more common to have a poisioned sensor, than carbon buildup, but its possible.

I see this every day.

[larryo340]

Try this out for size:

Quote:
<TABLE cellSpacing=0 cellPadding=6 width="100%" border=0><TBODY><TR><TD class=alt2 style="BORDER-RIGHT: 1px inset; BORDER-TOP: 1px inset; BORDER-LEFT: 1px inset; BORDER-BOTTOM: 1px inset">Originally Posted by http://free-auto-repair-advice.blogspot.com/2007/08/ford-egr-codes-p0401-p1408fix-clogged.html

Ford is known for problems with their DPFE sensors. These sensors detect the change in manifold vacuum pressure when the EGR is commanded on and off. If you get an EGR code, DO NOT automatically assume that it’s a bad EGR valve! Get a hand held vacuum pump and apply vacuum to the EGR. Check the operation of the valve. It if moves properly and the passages are clean, move on to checking the DPFE sensor. Use the same hand held vacuum pump to apply pressure to the sensor. Check for a change in voltage as you do this. If the voltages are within spec, move on to clear up this very common blockage.

Remove the throttle body and gasket. Behind the gasket you will find a half moon shaped passage with 3 openings into the intake manifold. Most likely you will discover that the passages are clogged with carbon buildup. Clean out the passages with a small pick and some throttle body cleaner. Then, install a new gasket and the throttle body. Your problem should be gone.

This problem is common on the 2.5, 3.0 Duratec, and the 4.6 liter engines.


Ditto :concur:


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[FakTorThis]

If this is whats wrong with it will that cause hesitation under acceleration and major loss of power because I know it should run in 16s in 1/4 mile but it wont run lower then 18.8

[Spectragod]

DPFE with cause all kinds of driving issues, lack of power, trans shifting etc.. These are computer controlled cars, one thing out of alighnment tends to throw a wrench in the whole mix.

I just fixed a Ford Exploder with a DPFE problem, he thought his transmission needed rebuilt, he was happy it was a $30 part.