ok, any more ideas? NO START
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ok, any more ideas? NO START - 10/20/2007 1:34:32 PM
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Whutdidyousay
Posts: 24
Joined: 10/9/2007
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I've tried and will continue to try whatever y'all think might work. I don't have $300 to have the truck looked at, so I am asking for any and ALL ideas. If nothing else I'll let her sit for a month and send her in. I'm not going to assume anything, so I'll just tell you what I know. (sorry for the long and possibly confusing post) I only had the truck 2 weeks when it started acting funny.
I started noticing a "miss" only when accelerating with moderate throttle, not when floored or light acceleration. I THINK the idle was a little high. Then the service engine light started coming on (32,35 EGR & IAC). Then one day the truck started dying and stalling like it was out of gas, but would start right back up..... Then it just died..... and I had to have it towed home....Then I removed the EGR & IAC then cleaned (weren't excessively dirty)and re installed them as instructed from people on here. I also checked the fuel pressure (60 psi) at the fuel rail and replaced the fuel filter.
The truck turns over and will attempt to start only for a second, but then it just continues cranking.... if I let it sit for a few minuites it will try to fire then nothing..... ANY ideas?..... THANKS!!!!!!!!
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'93 GMC Jimmy (Jamie)
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RE: ok, any more ideas? NO START - 10/20/2007 7:29:32 PM
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Chevy Lover
General Tech Moderator
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You say the fuel pressure was at 60psi. Does it hold 60 or does it drop when you crank it over?
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Give a man a fish and he will eat for a day, teach a man to fish, and he will sit on a boat drinking beer for a life time
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RE: ok, any more ideas? NO START - 10/20/2007 8:33:17 PM
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thegr81
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From: PHOENIX,AZ
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i agree with chevy lover check your pressure while cranking plus does it have all three essentials to starting air, fuel , spark go through that check as well and see what you find out
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2001 2wd 4.3 vortec v6
"I'm not fat, I'm a minitrucker"
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RE: ok, any more ideas? NO START - 10/21/2007 9:09:31 PM
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Whutdidyousay
Posts: 24
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I know I have spark...... I'll have to borrow the guage again and see what happens when I crank it again..... what does it mean if it drops off? what exactly should a good reading look like?
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RE: ok, any more ideas? NO START - 10/21/2007 9:12:03 PM
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swartlkk
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From: Waterloo, NY
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The pressure should not drop below 55psi. It shouldn't really drop when the key is turned off either, but a small leak down is to be expected on an old system.
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Kyle-
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RE: ok, any more ideas? NO START - 10/21/2007 9:12:25 PM
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thegr81
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i think its supposed to be 60 psi its in another thread i'll have to double check it may be 50 ok so i am editing this to provide the link for fuel pressure and were it should be at when checking it
http://www.blazerforum.com/m_60665/tm.htm go to this link here it will give you alot of info on fuel pressure hope this helps
< Message edited by thegr81 -- 10/21/2007 9:15:09 PM >
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2001 2wd 4.3 vortec v6
"I'm not fat, I'm a minitrucker"
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RE: ok, any more ideas? NO START - 10/21/2007 9:25:33 PM
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Whutdidyousay
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Thanks, is the '99 going to have the same #'s as the '93?..... I have both...lol
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'93 GMC Jimmy (Jamie)
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RE: ok, any more ideas? NO START - 10/21/2007 9:27:14 PM
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thegr81
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i'm not a 100% sure but if they are the same engine i.e. 4.3 i would think they would be i know someone else on the forum will come in with something different if it is but i think they would be if the same motor
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2001 2wd 4.3 vortec v6
"I'm not fat, I'm a minitrucker"
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RE: ok, any more ideas? NO START - 10/21/2007 9:57:43 PM
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swartlkk
Posts: 15294
Joined: 5/1/2005
From: Waterloo, NY
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It all depends on whether your '93 is a CPI motor or at TBI motor. The CPI should have the same pressure readings as the SCFI (96+) motor. A TBI motor should have 15-18psi, but I'll warn you ahead on this one... You are going to need an inline pressure tap adapter to read the fuel pressure on a TBI motor. They don't have fuel pressure test ports on them.
And, the CPI and SCFI are very different motors!
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Kyle-
My Restoration Projects
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RE: ok, any more ideas? NO START - 10/22/2007 9:03:35 PM
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Whutdidyousay
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it's CPI..... I'll buy the tester wed. and see what it says, thanks all!
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'93 GMC Jimmy (Jamie)
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RE: ok, any more ideas? NO START - 10/23/2007 6:36:37 PM
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Whutdidyousay
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well add another one to the books..... now it's running fine...???....??? dunno what I did, but it's runnin good with no lights..... maybe the truck was just testing me....???
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'93 GMC Jimmy (Jamie)
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RE: ok, any more ideas? NO START - 10/24/2007 5:14:38 PM
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Whutdidyousay
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well I had posted that my truck was running good..... that was only for 10 min and now it's a no start again...
1993 GMC Jimmy 4.3 CPI
ran good , but started acting like it was out of fuel again.... now no start.... checked fuel pressure and I have 60+ psi while cranking and with the key on..... maybe it's not a fuel problem....
is there a way to test the coil?.... I did the "screwdriver trick" and saw a spark, but could it be weak?
just looking for some direction to see what to check next..... don't wanna spend $200 to have it checked out.
also showing EGR and IAC trouble codes..... any help appreciated.
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'93 GMC Jimmy (Jamie)
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RE: ok, any more ideas? NO START - 10/25/2007 5:00:40 PM
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thegr81
Posts: 2639
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From: PHOENIX,AZ
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replace those sensors that could be the issue right there thats my suggestion unless someone else has a better idea
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2001 2wd 4.3 vortec v6
"I'm not fat, I'm a minitrucker"
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RE: ok, any more ideas? NO START - 10/26/2007 6:10:32 PM
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Whutdidyousay
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well today it ran good to go around the block twice then started acting up.... I checked the codes again and it gave me 33 & 35.... MAP sensor and IAC sensor...... wonder if I counted wrong the first time.... is there a way to test the map sensor? would it make it act funny?
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'93 GMC Jimmy (Jamie)
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RE: ok, any more ideas? NO START - 10/26/2007 8:09:41 PM
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wingnut_c_s
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A map sensor can be checked with a multimeter. A Haynes or Chiltons manual can tell you how to check it.
Another remote possibility could be vapor lock caused by the fuel line being too close to a hot engine part such as exhaust. It is uncommon with fuel injected engines, though.
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Mostly stock '91 S10 4x4 Blazer
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RE: ok, any more ideas? NO START - 10/28/2007 10:40:00 PM
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rmzinck
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Joined: 10/28/2007
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It really sounds like your egr sensor. I was having problems with rough idle and stalling and finally after much testing I came up with this sensor and replaced it and it ran like a champ again. Never had this problem again.
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RE: ok, any more ideas? NO START - 10/31/2007 4:21:10 PM
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corr33
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Just jumping in here............. If the port in the manifold is clogged.....sludge and stuff..........the engine will stumble and run rough and maybe not run. Same symtom as a bad egr but just no port for the exhaust gas to travel through........I have a 350 TBI and actually keep a spare intake manifold and swap it out every couple of years. JMHO!
Dont leave any stones unturned!
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RE: ok, any more ideas? NO START - 11/1/2007 3:45:38 PM
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Whutdidyousay
Posts: 24
Joined: 10/9/2007
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well now for another code.... I'm getting 33,34, & 35 now.....no 32 but the truck seems to be running great, no hard idling, no stalling....... I can't take it to the shop unless it's running bad.... I think I'll try to replace the MAP and the IAC.... really confused, I drove it about 5 miles today and it ran great. I can't trust it to go any farther than that.
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'93 GMC Jimmy (Jamie)
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RE: ok, any more ideas? NO START - 11/1/2007 7:27:21 PM
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wingnut_c_s
Posts: 3
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MAP sensors can be kinda pricey. One for my '91 is about $50. So I would probably try to test it first. The auto parts store may also be able to test some of your sensors for you for no charge.
Just a thought b4 you replace expensive sensors that are still good.
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Mostly stock '91 S10 4x4 Blazer
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