still lean....have no clues???

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10-10-2005, 08:22 PM

#11

86HOGT

5th Gear Member

Join Date: Sep 2003

Location: Phoenix, AZ

Posts: 3,105

RE: still lean....have no clues???

Your vacuum at idle should be from 17-21 on a stock cammed engine, then drop when you blip the throttle.

10-10-2005, 08:23 PM

#12

Derf00

Gentleman's Relish

Join Date: Feb 2005

Location: AZ

Posts: 13,090

RE: still lean....have no clues???

Quote:

ORIGINAL: 90Mustangfan

41. and 91. are the hego sensor say its lean...I just freakin replaced the O2' sensor....also its not the timing, I know that for sure. yes the vaccum is good, at idle its about 10 HG of vaccum and when rev'd it goes up to 15- 20 HG of vaccum...the vaccum is good. I dont even know if the car is actually running lean, it runs very strong and sounds very good....also will an exhaust leak cause it to run lean, I have a exhaust leak out of the cats where the smog to connect to the cats...well there is no smog tube so theres 2 hole in the exhaust.

Umm YEAH!!!! .[sm=headbang.gif] (didn't even think of asking that) Your O2 sensors help control the egr and fuel system assuming you have a sealed exhause system. It definitely would if fresh air mixing with you exhaust around the sensors. Put a couple of pipe plugs in there, reset the computer and see if comes back on.

10-10-2005, 10:13 PM

#13

90Mustangfan

I ♥ Acer

Thread Starter

Join Date: Jan 2004

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Posts: 1,259

RE: still lean....have no clues???

Ill try and plug it temporaily to see if the CEL comes on or not....but the sensors are before the cats...so how is fresh air going to go up stream the flow....IDK.....and my engine isnt stock its camm'd, stock heads though....It has comp cams cam in there and its a 306. my compression is 130psi, though Id add if it makes a difference. LOL. the vaccum goes down when I tap the gas, but soon after the vaccum is back up to normal....its not the vaccum thats fine...its not the egr system that all been replaced, and operates perfect the way it should.....