egr

winchman · 02-22-2009, 02:06 PM

i was looking under the hood today and i noticed that on the egr valve there is no vacumm line plugged in.on top of the intake where there are vac lines,one of the hoses is plugged off. i thought it went to the egr and while running i put the hose on the egr and the idle dropped way down and the motor ran bad . is the egr bad and with no vacumm to the egr could that cause the motor to idle high when the motor is warmed up?

leolkfrm · 02-22-2009, 02:27 PM

what are you working on!!

crabtruck · 02-22-2009, 02:57 PM

Believe it's his 88 f250 with a 5.0.
May be some related parts here bad idle

leolkfrm · 02-22-2009, 03:36 PM

thanks crab, i didn't recognize the post. It sounds like you are on the right track, Are you getting a CE light? sounds like someone was playing and you will need to check the vac line routing. We need a ford guru again with a diagram to help you.......

winchman · 02-22-2009, 03:47 PM

It is a 88 f250 with a 5.0 there is a bracket on top of the engine that holds 4 or 5 vacumm lines going everywhere. I saw one line plugged off. It was the right length to the egr valve. Just thought that is where it went and that is my high idle problem.

leolkfrm · 02-22-2009, 03:53 PM

It may have been disconnected because the egr is bad, but i would check the routing

winchman · 02-22-2009, 04:08 PM

I looked at all my manuals but no luck yet.i will have to find a simillar truck and look at it to compare. The check engine light is not on but this truck is hacked up by past great owners.i still like this truck

crabtruck · 02-22-2009, 05:59 PM

Seem to recall a missing restrictor for the EGR could cause that hi idle / surge thing.
May want to check the right EGR is in there, and clean and working.
I was thinking adding a vac to EGR would lower the RPMs, IDK.
Seems like the vac routing should have been on your VECI sticker
with EngCode=8k360-AA, Calibration#7-54W-R11 for f250<6,000GVW
Been a lot of years and I am not a ford guy.

May want to look at these:
for codes by jumper, codes may still be in memory-
AutoZone.com | Vehicle Selection - Year
for vac hoses (88 should be similar to 87 I think)
AutoZone.com | Vehicle Selection - Year

gmctrucks · 02-23-2009, 05:05 AM

Go to the library they should have a book there that will help you.

winchman · 02-23-2009, 10:35 AM

i went to a garage today and had it scanned. the codes were 51,34. they said because the truck will not warm to operating temp it is causing the coolant sensor code. i replaced the thermastat and ran it for 15min with cap off to get the air out.could it be the gauge be bad and causing the computer to make it idle high?

02-22-2009, 02:06 PM	#1
winchman Full Member Join Date: Dec 2008 Posts: 11	egr i was looking under the hood today and i noticed that on the egr valve there is no vacumm line plugged in.on top of the intake where there are vac lines,one of the hoses is plugged off. i thought it went to the egr and while running i put the hose on the egr and the idle dropped way down and the motor ran bad . is the egr bad and with no vacumm to the egr could that cause the motor to idle high when the motor is warmed up?

02-22-2009, 02:27 PM	#2
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	what are you working on!! __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

02-22-2009, 03:36 PM	#4
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	thanks crab, i didn't recognize the post. It sounds like you are on the right track, Are you getting a CE light? sounds like someone was playing and you will need to check the vac line routing. We need a ford guru again with a diagram to help you....... __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

02-22-2009, 03:53 PM	#6
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	It may have been disconnected because the egr is bad, but i would check the routing __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

02-23-2009, 10:35 AM	#10
winchman Full Member Join Date: Dec 2008 Posts: 11	high idle i went to a garage today and had it scanned. the codes were 51,34. they said because the truck will not warm to operating temp it is causing the coolant sensor code. i replaced the thermastat and ran it for 15min with cap off to get the air out.could it be the gauge be bad and causing the computer to make it idle high?

02-22-2009, 02:57 PM	#3
crabtruck Senior Member Join Date: Jul 2007 Location: on your 9 Posts: 3,364	Believe it's his 88 f250 with a 5.0. May be some related parts here bad idle

02-22-2009, 03:47 PM	#5
winchman Full Member Join Date: Dec 2008 Posts: 11	It is a 88 f250 with a 5.0 there is a bracket on top of the engine that holds 4 or 5 vacumm lines going everywhere. I saw one line plugged off. It was the right length to the egr valve. Just thought that is where it went and that is my high idle problem.

02-22-2009, 04:08 PM	#7
winchman Full Member Join Date: Dec 2008 Posts: 11	I looked at all my manuals but no luck yet.i will have to find a simillar truck and look at it to compare. The check engine light is not on but this truck is hacked up by past great owners.i still like this truck

02-22-2009, 05:59 PM	#8
crabtruck Senior Member Join Date: Jul 2007 Location: on your 9 Posts: 3,364	Seem to recall a missing restrictor for the EGR could cause that hi idle / surge thing. May want to check the right EGR is in there, and clean and working. I was thinking adding a vac to EGR would lower the RPMs, IDK. Seems like the vac routing should have been on your VECI sticker with EngCode=8k360-AA, Calibration#7-54W-R11 for f250<6,000GVW Been a lot of years and I am not a ford guy. May want to look at these: for codes by jumper, codes may still be in memory- AutoZone.com \| Vehicle Selection - Year for vac hoses (88 should be similar to 87 I think) AutoZone.com \| Vehicle Selection - Year

02-23-2009, 05:05 AM	#9
gmctrucks Senior Member Join Date: Nov 2006 Location: Houston,Texas Posts: 4,033	Go to the library they should have a book there that will help you.

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