Quote:
Originally Posted by Joe Bob
CIS diagnostics needs gauges. The fuel pump has a check valve in the outlet neck. Cheap part and a common issue.
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Have gauges. I posted the pressures. CCP=1.4, WCP=3.3, System=4.3, resid-10min=1.5, resid-30min=1.1. Checked fuel pressures so many times I could do it blindfolded behind my back. Considered check valve, which is partly why I replaced fuel pump, no luck.
As for leak detect attempts:
Plugged the exhaust pipe with tennis ball and duct tape. Disconnected the hoses behind the intake boot and plugged them (made it easier to move the intake boot). I took the intake boot off of the throttle body.
Connected a hose to throttle body, ensured it was air tight connection. First blew cigar smoke into hose (checking for big leaks), no leaks observed. [
I don't smoke, so this was quite a nauseating exercise] Then sprayed many components with soapy water and hooked up compressor to hose. Still no observable leaks.
The mechanic went a much more simple route. He just connected the smoke machine to the air intake (i.e. into the air filter area). When no leaks were observed, he then connected to inside the pop off valve. Nothing observed.
I watched some videos of people using smoke machines, they almost always go through the throttle body... So don't 'really' trust the mechanic's analysis. Anyone know of good smoke machines at a decent price? I've seen ones on amazon, but I'm really suspect of the quality. Snap-on has decent ones (what the mechanic used), but they are pricey!