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04-23-2016, 03:36 PM
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#1 |
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69 c/10 lwb fleetside
Join Date: Jul 2004
Location: saint joseph TN
Posts: 195
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91 s15 jimmy hard cranking
my jimmy with 4.3 tbi has just started acting up, it has always cranked right up without giving it any gas, but now i have to hold it about half way down for it to crank and after warming up it runs pretty well normal maybe idles just a hair low. im thinking it might be something simple like a vacuum leak or dirty sensor or something, just wondering if anyone might have any ideas where i should start.
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69 lwb fleetside  67 swb fleetside  (2) 72 lwb fleetside 50 swb no bed  65 impala ss  65 1 ton flatbed
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04-23-2016, 05:44 PM
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#2 |
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69 c/10 lwb fleetside
Join Date: Jul 2004
Location: saint joseph TN
Posts: 195
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Re: 91 s15 jimmy hard cranking
no check engine light btw.
__________________
69 lwb fleetside 67 swb fleetside (2) 72 lwb fleetside 50 swb no bed 65 impala ss 65 1 ton flatbed
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04-24-2016, 11:30 AM
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#3 |
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Registered User
Join Date: Aug 2012
Location: error 404 location not found
Posts: 816
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Re: 91 s15 jimmy hard cranking
How long has it been since the fuel filter has been changed, for vacuum leaks you can try and spray around the intake and around the throttle body base. Another possibility could be the fuel pump getting weak but i dont believe tbi needs alot of pressure. Does it have any sort of miss or feels a bit sluggish since you been having the hard starting issue.
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1995 s10 blazer 4.3 1967 c10 350/350 fleet short 1993 s10 blazer 4.3l 4l60 RIP 6/20/14 2000 mercury sable Thats a how I roll |
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04-24-2016, 06:32 PM
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#4 |
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69 c/10 lwb fleetside
Join Date: Jul 2004
Location: saint joseph TN
Posts: 195
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Re: 91 s15 jimmy hard cranking
about first of the year i had to change fuel tank pump and filter, has no other issues other than have to give it gas to start it vs used to would just turn the key and it would crank. what on these engines makes it idle fast when u crank it?, it no longer does that either so what ever causes that could be the culprit maybe?
__________________
69 lwb fleetside 67 swb fleetside (2) 72 lwb fleetside 50 swb no bed 65 impala ss 65 1 ton flatbed
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04-24-2016, 06:45 PM
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#5 |
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Registered User
Join Date: Aug 2012
Location: error 404 location not found
Posts: 816
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Re: 91 s15 jimmy hard cranking
What i would do is try to prime your engine about 3 to five times and see if it would start. A fuel pressure gauge would help alot to make sure your at constant pressure. Its seems as if fuel isnt staying pressurized
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1995 s10 blazer 4.3 1967 c10 350/350 fleet short 1993 s10 blazer 4.3l 4l60 RIP 6/20/14 2000 mercury sable Thats a how I roll |
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04-27-2016, 01:19 PM
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#6 |
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Senior Member
 
Join Date: Aug 2013
Location: Northern Santa Barbara County, California
Posts: 2,671
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Re: 91 s15 jimmy hard cranking
Check to see if your fuel pressure regulator is leaking, its on the back side of the throttle body. Rebuild kits are cheap about $25.00 at your local parts store and takes about an hour. The hardest part is overcoming the spring pressure and tightening the screws when replacing the diaphragm.
http://www.autozone.com/fuel-deliver...?checkfit=true https://www.youtube.com/results?sear...+body+rebuild+ Casey |
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