Sudden RPM surge/spike (when stopped in drive)!

gcretro · Post by **gcretro** » Sat May 26, 2012 8:51 pm

04 Neon SE

I was stopped at red light in drive. As always the RPM dropped to about 500 to 600ish.

Then there was sudden surge and the RPM spiked to I think around 1500. I was holding the brake very lightly so the car surged forward. Fortunately I wasn't close to the car ahead.

I am aware of the idle RPM dropping but this surge was the first.

Anything I need to check? Other than clean the IAC (which I have already done recently)

gilly02le · Post by **gilly02le** » Sun May 27, 2012 7:26 pm

check for vacuum leaks. Cracked hoses, loose clamps ect.

gcretro · Post by **gcretro** » Sun May 27, 2012 8:25 pm

any specific areas or tubes to check for vac leaks? Is there a diagram of the vacuum tubes?

And where is the MAF sensor located on a second gen?
thx

Post by **occasional demons** » Sun May 27, 2012 9:59 pm

MAP sensor is located on the right side of the IM in the front.

Basically any tubing coming off the IM should be traced/checked. Some of the earlier TB's have a small rubber cap towards the front of the car. They can dry rot, and crack. The extra vacuum port was eliminated on the newer TB's.