I've been reading through alot of old threads but haven't come across my weird problem. I'm pretty sure I have a bad check valve on the fp. Takes long turn over to start cold unless I switch the key on/off 2 or 3 times. I can deal with that. Big problem is, when it's fully warmed up, and I shut it off for for a few minutes, (5-10 mins) and restart it, it stumbles to start, but always starts. The rpm's are low(about 500) and there is a low pitched humming noise coming from under the hood. If I rev it up for a couple seconds, the noise goes away and then the engine idles fine. It has no codes at all. Before, during and after all this, the car always runs great going down the road. Anyone with any ideas of what I'm over looking?
Hard start when warm and......
- Thread starter SHOYAY
- Start date
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trainguy1989
SHOtarted
This has happened to me. The intake is heat soaked. The air ambient temp sensor in the air box is reading cooler air than what is going into the engine at start up (a whole bunch of hot air). By revving the engine you force the cooler air from the air box into the intake and all is well. This only happens to me on very hot days. Also for future reference a bad air ambient temp sensor can cause the SHO motor to run like complete crap.
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