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04-29-2012
Ok lately I've been having my rpms drop at 45-50 Mphs. Usually happens under slow acceleration. If I punch it it'll shift fine and shows no issues. Any ideas? I was thinking cat but that was just replaced 3 days ago. Trans was rebuilt maybe a month and a half ago. Also, what's the vacuum reading at idle. Mines was saying 15.9. I'm thinking that's wrong. Thanks guys
04-29-2012
Thats alittle high at idea, usually its like 13-14
Over drive kicks in around that speed and drops the rpm down like 3-400. If thats what your talking about
04-29-2012
Ok that's what I just read about the overdrive. Thanks. What can I do about the vacuum reading
04-29-2012
Got to go hunting, take a can of carb cleaner, start car, spray lines and hoses with the carb cleaner(not all at once spray in small areas) when you hear the engine rpms go up in youve sprayed over the leak, then start zeroing in on the leak
04-29-2012
huh?
Vacuum at Idle should be ATLEAST -19. My car runs at -20.3 all day long at idle.
If your only at 15ish you have a vac leak.
04-29-2012
Maybe i thinking about na motors, idk if a boosted motor is different
04-29-2012
Ok so try the carb cleaner trick
To find the leak. I was thinking it should be at 20 but wasnt sure
04-29-2012
Nope, should both be around the same.
04-29-2012
Any particular place to look for a leak?
04-29-2012
The engine bay...lol
04-29-2012
Vac tree.
Any of those lines.
Any of the T's or connections on the line from the FPR to the LIM to MAP.
Gasket leaks, if you ever taken the blower or TB off.
EVAP hose to TB.
Follow any vacuum line.
04-29-2012
Alright will check first thing in the morning. Thanks. I'll post back with results.
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