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What is causing it to run slightly rich and backfire at times and seem like it hesitates some?

Tiny
MANUEL81
  • MEMBER
  • 1987 FORD MUSTANG
  • 166,000 MILES
It has a vacuum leak from the brake booster. It idles erratically. No engine mods. Does have long tube headers with the o2 sensors. Haven't checked timing but I don't feel
as if that's it. Any help would be greatly appreciated.
Thursday, September 15th, 2011 AT 2:19 PM

2 Replies

Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
FIX VACUUM LEAK!

WANNA SEE A CHANGE? TEMPORARILY PLUG OFF VACUUM TO THE BOOSTER.'COURSE YOU DON'T WANNA DRIVE IT LIKE THAT. BRAKES WILL NOT FUNCTION CORRECTLY. MIGHT NOT BE WORKING RIGHT NOW, WITH THE LEAK

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Thursday, September 15th, 2011 AT 3:02 PM
Tiny
MANUEL81
  • MEMBER
  • 2 POSTS
I fixed the vacuum leak n it does run better. I have also changed plugs, wires, cap, and rotor. Also have set the gps at.98 volts. I still have a problem with it backfiring thru the intake. It only pops back once or twice n that's it. Only does it when engine is cold andk it may only do it 2 or 3 times a week. What gives? Im fixing to bypass egr n use an egr simulator n its place. Any help is greatly appreciated.
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Tuesday, September 27th, 2011 AT 8:02 PM

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