John Moore
I'm Awesome
I have the 4 volume set but they’re in storage right now. If you can send the pdf, that’d be great!!
5.7 Vortec high idle
- Thread starter John Moore
- Start date
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I have the 4 volume set but they’re in storage right now. If you can send the pdf, that’d be great!!
actually, if you need it now, the 1999 manual is available in the service manual thread. one sec
see this post:
88-98 Service Manuals
Over the years I have collected a bunch of GM service literature. Links to PDF Scans of service and STG manuals and a links to the Parts manuals. You'll need the FREE Adobe Acrobat reader to open these files. Get it directly from Adobe here {http://get.adobe.com/reader/} If you're not...
www.gmt400.com
see attachment
The cold mixture is artificially enrichened, hiding any vacuum leaks. Once the engine's warmed up the mixture leans out enough to stall.
clyderedman
Newbie
Mine high idles crazy high replaced all sensors ,can't find vacuum leak either?
Any help appreciated
Any help appreciated
Carlosm86
Newbie
My 98 L31 would also idle high and get random misfires throughout all the cylinders, specially #2. It never stalled out completely, but felt like it would sitting at a stop for a long period of time. I knew all the symptoms I was having was a vacuum leak, but could not find it via carb cleaner & propane. As much as I didn’t want to, I finally invested in a smoke machine and found the vacuum leaks. Gasket from the new spider wasn’t sitting right in an aftermarket (dorman) upper intake and the connector from the brake booster hose going to the top of intake. I thought it was because I went with a dorman and that the opening was shaped wrong, but once I pulled the TB and looked inside with an inspection camera I can see the gasket not sitting right in the opening.
