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#1
06-13-2006, 04:19 PM
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silverado won't start....sometimes
my '91 4.3L silverado sometimes will not start....only have 2 spray starting fluid in throttle body to get it started....then it cranks and runs fine...no matter how far you drive it....this does not happen every time either...but it does happen enough to be pretty aggravating!!....i just had the fuel pump,strainer,filter,fuel pump relay replaced(i suggested to mechanic it was fuel pump....so he replaced it...didn't help)...i then replaced the fuel filter....it seems MAYBE a little better now...but still has done it 2x in 3 or 4 days..anyone have any ideas on this?
thanks, wes 
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#2
06-13-2006, 06:26 PM
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Re: silverado won't start....sometimes
Quote:
MT
__________________
Remember proper testing gives us the answer to many problems. MT
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#3
06-13-2006, 08:12 PM
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Re: silverado won't start....sometimes
your battery might need to be replaced
__________________
Simon R 2001 Silverado W/T 4.3 124,000
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#4
06-14-2006, 11:22 AM
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Re: silverado won't start....sometimes
Quote:
this is my first time on here...is the right way to replay to posts?....anyway...thanks guy...def sounds like it may be low fuel pressure...i'm just gonna have to take it to the shop...and make sure they test the fuel pressure (the guy i had working on it told me call him when it messes up again...that that was the only way he could figure it out)...thanks again wes
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#5
06-14-2006, 01:05 PM
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Re: silverado won't start....sometimes
Quote:
Welcome to the forum on AF. But Your post no does say no 2 post for some reason. And it does help to catch it when it does it. And for sure check fuel pressure and the the fuel pump for full pressure and leak down and alll of the good stuff. Good luck and let us know how it goes. Mt
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Remember proper testing gives us the answer to many problems. MT Last edited by MT-2500; 06-14-2006 at 08:02 PM.
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#6
06-14-2006, 07:26 PM
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Re: silverado won't start....sometimes
when it fails to start, does it, turn over fine, sputter and try, is the check eng light on , can you hear the fuel pump energize when you turn the key to on?
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#7
06-16-2006, 04:11 PM
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Re: silverado won't start....sometimes
Quote:
it turns over fine...plenty of battery power and starter is fine...i can hear the fuel-pump too....never sputters...if it does, it cranks....never can tell when it's gonna do it...at first i thought it was when parked on a hill...but that's not it..will do parked in any position...again..once it cranks, it runs like a new truck wes
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#8
06-18-2006, 04:26 PM
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Re: silverado won't start....sometimes
Yep my 89 camaro is doing the same thing, Runs great but sometimes the fuel injectors dont fire at start up, but if you give it some str fluid fires rt up. Is the truck throttle body or multiport injection? regardless try to see if its fireing the injectors when it dont start of if it is then the computer is not mixing the fuel rt, ex bad temp sending unit, bad air temp sending unit , bad computer.If you find out let me know Ive been trowing all kkind of parts at mine.
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#9
06-20-2006, 02:47 PM
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Re: silverado won't start....sometimes
My 99 was doing the same thing, however it did start, albeit hard. Then ran just fine after it started.
Check the fuel pressure regulator located on the fuel rack. Pull the vacuum line off of the regulator and sniff it for the smell of gasoline. If you smell gas in the vacuum line, your regulator is bad. Replace it. Took me 10-15 minutes to remove the old one and replace it with new. Good luck! Gary
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Gary the Engineer ________________ 1999 Silverado 4.8L Vortec 1999 Mercury Sable 1973 Mercedes 450SL Roadster Current Cylinder Index...29
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#10
06-20-2006, 03:50 PM
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Re: silverado won't start....sometimes
Quote:
__________________
Remember proper testing gives us the answer to many problems. MT
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#11
06-20-2006, 04:26 PM
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Re: silverado won't start....sometimes
Yeah, I'm not familiar with the 91 fuel system. Sorry if my reply put you off track. I could still be off base here but the problem does sound like maybe excess fuel is flowing unregulated and may be flooding the cylinders. Yes???
Gary
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Gary the Engineer ________________ 1999 Silverado 4.8L Vortec 1999 Mercury Sable 1973 Mercedes 450SL Roadster Current Cylinder Index...29
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#12
06-20-2006, 06:15 PM
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Re: silverado won't start....sometimes
Quote:
If it takes starting fluid or carb cleaner to start it it is more no fuel or low fuel pressure. But to much fuel will give a hard start to. That is why you need afuel pressure gauge to see what is going on. MT
__________________
Remember proper testing gives us the answer to many problems. MT
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#13
06-21-2006, 12:12 PM
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Re: silverado won't start....sometimes
guys....a while back my distributor module went bad on my truck(which has to do w/ fuel timing)..and it would run really rough....before i took to shop to find out what it was...i tried several different kinds of throttle body sprays to clean it....all were supposed to be safe for fuel injection(also used fuel injector cleaner in gas)....but i am really suspecting that it damaged the fuel pressure regulator as one of you guys mentioned!!!(my manual for truck also says don't soak regulator in any kind of cleaner!!!)...i just saw your reply..i ordered the pressure regulator yesterday and will be putting it on tomorrow!!!...yeah...i took a chance on that being what it is, but i feel like it has to be the problem...it all makes sense now...btw..the regulator is pretty easy to replace on the 91 too..it's right on top of throttle-body(i'm replacing the whole piece---spring and diaphram already inside!)..thanks to all of you for your help...i'll let you know how it turns out!
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#14
06-21-2006, 01:00 PM
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Re: silverado won't start....sometimes
Quote:
   MT
__________________
Remember proper testing gives us the answer to many problems. MT
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#15
06-26-2006, 10:49 PM
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Re: silverado won't start....sometimes
Have you had your hose checked? There could be a collapsed line, either an input, or a return. A collapsed line will cause intermittent, eventual failure to deliver gas. You can disconect both from the TBi, blow some air through them, just make sue and disconnect them on the other side before doing so. Have you check to make sure your injectors are not clogged? Have someone start it while you watch it spray. There should be a very solid stream. Keep us posted, and good luck
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