Question about Cars & Trucks
My engine wont start in hotter weather but has no problem starting when its cold outside.
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Posted on Jan 02, 2017
SOURCE: 99 suburban wont start sometimes
I had a similar ongoing problem with my 1999 GMC Suburban C1500, it occurred only in the hottest days of the Texas summer. In addition to not starting, the truck sometimes exhibited symptoms of misfiring while driving at highway speeds, as if the engine seized or as if there no fuel being delivered to fire.
I found a small garage mechanic who swore he could fix it after years of taking it to the dealer and other franchise repair shops and getting the same answer "we can't find anything it like you described, it won't do it while we're testing it, bring it in right away so we can get the history codes....blah, blah, blah". I always thought it was due to an intermittent electrical grounding issue. Anyway, long story short, the small garage mechanic was guessing a lot of the time, but after changing the fuel pump, the sending unit, fuel injection system and many return trips to the garage with me saying 'that wasn't it, it's still doing it" it finally turned out to be a faulty wiring connector link in the harness assembly ABOVE the FUEL TANK that came from the pump or sending unit. When it got hot the link would melt and create a short, when it cooled a bit it would still conduct. We replaced the wiring connector and 4 years worth of unexplainable intermittent starting problems disappeared. I spent $2K to $3K over the years, when it finally turned out to be a hidden $12 wiring connector.
Posted on Jan 18, 2009
The knocking or ticking is going to determine if it is in the top end, lifters, push-rod or rocker arm issue or the bottom end that would include pistons or bearings.
If it is a ticking noise, it will more than likely be a valve train issue.
If a knocking noise, piston or crankshaft related problem.
Attached is a web site that you can listen to a piston slap which is a known issue for your 4.3.
Listen to the noise and see if it sounds similar to your problem. A piston slap will generally sound as though it is coming from the central area of the engine.
Listen to the recording and let me know.
Posted on Apr 19, 2009
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