Web
Analytics Made Easy - Statcounter
V8 Esprit Popping noise/rough idle - Engine/Ancilliaries - The Lotus Forums - Official Lotus Community Partner Jump to content


IGNORED

V8 Esprit Popping noise/rough idle


GrahamS

Recommended Posts

I have had a popping noise from the exhaust at idle for a while which is kind of annoying and am currently chasing down vacuum leaks. I have a steady -15inHg at idle measured at the back of the plenum - is this in the normal range?

I've found a couple of leaks: split pipe leading to climate controls)and am in the process of changing the crankcase breather non-return valve, which had turned into a tube. Apart from the popping/lumpy idle the car runs great. Suggestions welcome and appreciated.

Cheers, Graham

Y2K V8. Black on black.

 

Link to comment
Share on other sites


Upgrade today to remove Google ads and support TLF.
  • Gold FFM

Are both cats in one piece ??

is it a car that's used regularly ? I did have a pop on mine and run some injector cleaner called Lucas oil through the tanks - that made a massive difference.

o2 sensors are the other thing to look at on some diagnostic kit - just to make sure they are doing the right things.

vacuum leaks need to be eliminated of course

Only here once

Link to comment
Share on other sites

Thanks Barry - any opinion on the vacuum reading?

In response to your comments, the car is driven at weekends only and I keep the battery on a tender between runs. The O2 sensors and 200cpi cats are new this season. RC  injectors were cleaned and calibrated prior to installation last year. They only have about 3000 miles on them but i guess i could try the injector cleaner. 

The popping noise has been present since i bought the car and i've been slowly trying to eliminate it by adding the items mentioned above.

Link to comment
Share on other sites

This is tough to find.  The secondary injectors could be dripping if they were not replaced at the same time as the primary injectors. If it is consistently doing the popping at idle you could temporarily remove the CATs (generates an error code) and see if the popping stops. If it does that would be a strong indication that excess fuel is being touched off in the CAT.

The Older I get the Faster I was

Link to comment
Share on other sites

  • 11 months later...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...

Important Information

We use cookies to enhance your browsing experience, serve personalized ads or content, and analyze our traffic. By clicking " I Accept ", you consent to our use of cookies. We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.