1998 401 code

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Nov 14, 2008 | 05:33 PM

kojack

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1998 401 code

have cleaned throttle body, changed egr valve and goes off for about 30 miles,have air thur vents changed at higher rpm.s to defrost,need help,what else can it be?????????

Nov 14, 2008 | 06:04 PM

Bobby82490

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From: N. Fort Myers,FL

Not to be rude... but grammer is your friend.

Anyway did you clean the TB or did you clean the TB EGR ports? The A/C through the defroster is a vaccum problem.

Nov 14, 2008 | 07:39 PM

kojack

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1998 ford

yes i did, cleaned out both,and like i said if i turn my air on at higher rpm's it starts blowing out the defrost till i let up.

Nov 15, 2008 | 05:21 AM

Bobby82490

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From: N. Fort Myers,FL

Your DPFE sensor is probably bad then. As for the A/C, I cant really help you, Im not familar with the vaccum operated A/C. Do a search and you will see many threads with the same problems as you.

Nov 17, 2008 | 10:06 AM

KingRanchMan02

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From: Louisville, Kentucky

There is a vacuum line through the firewall in the area of the battery that supplies vacuum to the heater controls.
Take a look at that line and the lines that run over into the fender well where the vacuum accumulator is located. Some guys find that the battery has dumped some acid out that has eaten through the vacuum lines.
Has the truck ever sustained damage in the right front? If so, the accumulator may have been damaged. Good luck!