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98 chevy blazer problems PLEASE HELP any help would be appreciated

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Old 03-22-2009, 01:48 PM
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Default 98 chevy blazer problems PLEASE HELP any help would be appreciated

ok heres the deal, it turns over wont start, the pump is running when this happens. it shuts off of me at times like when i come up to a stop light or in drive thru, sometimes it starts back fine other times it leaves me sit for a while. this problem started near the end of last summer, and as weird as this may sound when its cold outside it doesnt shut off on me and is still hard to start but in the summer and now that its starting to warm up shuts off frequently but is still hard to start...here is a list of parts i have already replaced....

fuel pump
mass air flow sensor
throttle body position sensor
engine coolant temp sensor
thermostat(it was stuck and over heating when all this started)
distributor cap and rotor button
fuel filter

also i had the pressure of the pump tested and it was ok

any info and help would be greatly appreciated
 
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Old 03-22-2009, 02:59 PM
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Are there any codes stored in the PCM?

Do you notice the "security" light being on longer than normal or on when you are having trouble starting the truck?
 
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Old 03-23-2009, 03:09 PM
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no codes, no check engine light nothing...i'm getting ready to do a fuel pressure test again
 
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Old 03-23-2009, 03:20 PM
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Hhmm, bad ICM or IAC, maybe?
 
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Old 03-23-2009, 04:43 PM
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turn key on = 58 psi
started and running = 54 psi
turn key off and i lose pressure fast, approx 20 psi in 5 minutes, but right now it is starting, going to wait till it wont start to test pressure then
 
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Old 03-23-2009, 05:20 PM
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Uh, oh. Sounds like the FPR is going south. Read this thread for diagnostic info.
 
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Old 03-23-2009, 05:47 PM
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thats kinda what i was leaning towards myself, do you have any diagrams showing how to change that??

and IF it were the pump would it run at all when it does not want to start? because when i am trying to start it, i can hear the pump kick on for a couple seconds like its supposed to but it doesnt start, and also when it shuts off on me i can hear the pump then kick off too
 

Last edited by BlazerPunisher; 03-23-2009 at 06:25 PM.
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