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Vacuum leak?

Tiny
BUDDY56
  • MEMBER
  • 1998 CHEVROLET MALIBU
  • 163,000 MILES
I have a rough idle I htink it is a vaccum leak but I dont know where what is the best method besides a smoke machine
Saturday, September 15th, 2012 AT 2:52 PM

4 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Take choke cleaner and cleant eh throttleplate on both sides first. Then if it still idles roughspray the same cleaner around intake to seeif you can find it. If you rpms change you have the area wher eit is leaking.
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Saturday, September 15th, 2012 AT 3:17 PM
Tiny
BUDDY56
  • MEMBER
  • 12 POSTS
I did the throttle cleaning and the maf sensor cleaning. Also I cleaned the iac. Is there any way to clean the egr valve on that car and also the map sensor
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Tuesday, September 18th, 2012 AT 3:22 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan for codes and check fuel pressure first. You have to taek the egr off to clean but he passagae may be blocked. You cannot clean teh map sensor. Check around pcv valve for vacuum leak or the pipe running to throttle body, they crack as they are plastic.
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Tuesday, September 18th, 2012 AT 1:27 PM
Tiny
BUDDY56
  • MEMBER
  • 12 POSTS
I had a code 1108 but did not set off the light. I will try to clean the egr. I recently replaced the hose for the pcv along with the pcv valve
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Thursday, September 20th, 2012 AT 1:45 AM

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