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woody
Novice
Aug 13, 2008, 12:27 PM
Post #1 of 18
(2980 views)
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o.k. peeps ya gotta help me out here. I drive a 93 Chevy Astro. A couple of weeks ago I was driving to work when it died on me. So I got it started, drove a little further, died again. Before all this every now and then when i would start it, the engine would rev up w/o me touching the gas. So now when i do start it, the engine revs then dies. Today i started it 3 times it only acted up once. So what's the deal??? My hubby thinks maybe the idle air speed motor? We welcome your thoughts.
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Double J
Veteran
/ Moderator
Aug 13, 2008, 1:13 PM
Post #2 of 18
(2978 views)
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Check engine light on or does it come on while driving/running?
Have the system scanned for any trouble codes first.(Autozone/parts chains do this for free)
Have the fuel pressure checked using a fuel pressure gauge.( Autozone rents gauges for this)
Thats a starting point...
Post back any findings...
Jim
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Guest
Anonymous Poster
Aug 13, 2008, 1:31 PM
Post #3 of 18
(2977 views)
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check engine light only comes on when starting. Hubby hooked up scanner, said o.k. to drive.
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way2old
Veteran
/ Moderator
Aug 13, 2008, 3:54 PM
Post #4 of 18
(2972 views)
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I agree with Jim on having the fuel pressure checked. Post back the pressures for us.
Being way2old is why I need help from younger minds
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Jeff Norfolk
Enthusiast
Aug 13, 2008, 8:20 PM
Post #5 of 18
(2967 views)
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I just repaired a 98 Astro today with a similar problem. Die while running, restart fine then die again a bit later. Hooked up my pressure gauge and drove around till it dies. It lost fuel pressure right before it would die. Replaced fuel pump and all is well. Fuel filter also of course.
Jeff
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woody
Novice
Aug 14, 2008, 4:18 PM
Post #6 of 18
(2955 views)
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how do you tell which/ throttle postion sensor/ idle air speed control motor is bad. does not act like fuel prob is random also rpms jump without using throttle.
woody
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Guest
Anonymous Poster
Aug 15, 2008, 4:12 PM
Post #7 of 18
(2940 views)
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why then would the engine idle speed jump on its own? if the prob was fuel press?
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Guest
Anonymous Poster
Aug 16, 2008, 6:51 AM
Post #9 of 18
(2929 views)
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what is the specs on the fuel pump? how any psi?. I only asked these questions with doubts due to the nature of it when it fails.am a mechanic for 12 yrs so far sure acts like electrical failure. but would appreciate the specs for testing fuel pressure i guess i should rule it out. thank u for the suggestion
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 16, 2008, 7:16 AM
Post #10 of 18
(2925 views)
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Me bad - I'm not certain so quick for 93 Astro. I think 53-59 is the spec. Some, especially GMs won't behave with just a pound or two under spec! See if the guys have a more exact range for the norms. Remember that when engine is running you are operating with higher voltages than just with KOEO situation which still needs to be adequate,
T
(This post was edited by Tom Greenleaf on Aug 16, 2008, 7:18 AM)
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way2old
Veteran
/ Moderator
Aug 16, 2008, 8:32 AM
Post #11 of 18
(2921 views)
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Alldatapro has vin W listed at 55 to 61 psi.
If it is vin Z the pressure is 9-13 psi.
So now we need to know which engine you have.
Being way2old is why I need help from younger minds
(This post was edited by way2old on Aug 16, 2008, 8:36 AM)
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woody
Novice
Sep 5, 2008, 4:12 PM
Post #12 of 18
(2880 views)
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it is a w motor has approx 52 58 psi woody
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woody
Novice
Sep 5, 2008, 4:14 PM
Post #13 of 18
(2879 views)
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fuel pressure is 52 to 58 psi when it dies never loses pressure runs alot of the time about 50 -52psi
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woody
Novice
Sep 5, 2008, 4:15 PM
Post #14 of 18
(2878 views)
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check eng light only on when starting have scanned no codes also fuel pres at 50 -58 psi never loses pressure
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woody
Novice
Sep 5, 2008, 4:17 PM
Post #15 of 18
(2877 views)
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have also replaced throttle pos sensor and idle air control valve no changes
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Guest
Anonymous Poster
Sep 5, 2008, 4:29 PM
Post #16 of 18
(2874 views)
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when checking fuel pres it will jump up when throttling up when u let of will drop to about 48 psi then right back to 50-54psi approx
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Guest
Anonymous Poster
Sep 5, 2008, 4:38 PM
Post #17 of 18
(2872 views)
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just to let u know last 5 or six replies are me woody and i have also replaced fuel filter
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Guest
Anonymous Poster
Sep 21, 2008, 4:30 PM
Post #18 of 18
(2759 views)
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thought i would let u know i fixed the problem it was electrnic ign module.I bet none of u thought of that HuH?????? thankx for the help
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