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Old 08-02-2012, 04:23 PM   #1
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ford E350 5.8 high idle problem

ok just like the subject says

93 e350 5.8 auto

the idle last couple months have been creeping up so i pulling the air box off to look into the throttle body ....

we found a few vacumm hoses off so i replaced the bad ones

still high idle

so we replace the idle air control valve no difference in the idle....

im thinking it might be TPS any thoughts?????
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Old 08-03-2012, 08:38 PM   #2
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Re: ford E350 5.8 high idle problem

wow 31 looks but no comments....
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Old 08-03-2012, 11:27 PM   #3
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Re: ford E350 5.8 high idle problem

I think the problem with no replies is no one has had that problem.
Personally I answer things I know about but I dont know anything about pre OBDII (1995 or older) Fords fuel injection.
A lot of the guys on here have diesels and V-10s or newer V-8 vans with OBDII and can use a scanner for problems like that.

Did you check the blink codes? It should have at least one.
It sounds like a vacuum leak at least on the cars I know about that would be the problem.

Oh I just found this maybe it would help.

http://www.f150online.com/forums/v8-eng ... -5-8l.html

Good luck..please post what fixes it even if know one replies.. then if nothing else we might be able to help the next time..
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Old 08-06-2012, 11:30 PM   #4
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Re: ford E350 5.8 high idle problem

Check to make sure the throttle body isn't sticking open. This can be just from a dirty throttle body, but it could also be a rusty throttle cable.

Is it a MAF (mass airflow) or MAP (manifold absolute pressure) driven system? If it is MAP, a bad MAP sensor can cause high idle. The sensor basically upstream of everything else in the whole fuel/air management system. MAF setups are a little smarter.

If you rule out the MAP sensor, take some carb-cleaner and spray around the intake. An intake leak can cause erratic idle.
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Old 08-07-2012, 04:57 PM   #5
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Re: ford E350 5.8 high idle problem

thanks for the info ... i havent had a chance to check things but need to soon....

if and when i find the problem i will post what it was so it may can help others....
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Old 08-07-2012, 08:39 PM   #6
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Re: ford E350 5.8 high idle problem

Quote:
Originally Posted by carringb
If you rule out the MAP sensor, take some carb-cleaner and spray around the intake. An intake leak can cause erratic idle.
I would also recommend checking for a vacuum hose or intake air leak.

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Old 08-10-2012, 09:57 AM   #7
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Re: ford E350 5.8 high idle problem

thanks for the input... i think we have a few things going on and next week i can try to start looking....

i noticed after the idle valve install when you start van up 1st thing and then step on gas pedal

it acts like ts stuck.... so i look and the throttle body and tried to move the butterfly's to see if it was staying open and didnt see any movement...

also after it runs for about a min you can hear the idle change like a valve opened and then thats when the idle gets higher....

next week ill have time to dig in and look at things....
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Old 10-02-2012, 06:42 PM   #8
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Re: ford E350 5.8 high idle problem

well next week turned into a few months.....

we are changeing out the TPS should have it back together later this week.... i will let you know what happens...
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Old 10-02-2012, 06:59 PM   #9
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Re: ford E350 5.8 high idle problem

Cool! I feel bad we can't help more from out here in cyberspace but you did work up some curiosity!
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Front Axle - 1 Ton Spec Dana 60/King Pin/Open Knuckle/High Steer
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Eaton E-Lockers Front And Rear/4:10 Gears
ARB Differential Covers - Nodular Iron With Dipstick And Drain Plug
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46 Gal Transfer-Flow Fuel Tank
ExtremeAire Magnum Air Compressor
Reunel Rear Bumper
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Old 10-04-2012, 09:01 AM   #10
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Re: ford E350 5.8 high idle problem

thank s for all the suggestions.... we got it back together and fired it off

it runs and after 30seconds the idle goes down instead of hogher like it was doing.....

so it was the TPS now we will buttom everthing up and take it on a test run at lunch time today....
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