Popping noise on decel
#1
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Join Date: Mar 2007
Location: SE Michigan
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Popping noise on decel
I did a search for pops, popping + decel and read the all threads, so I know this has been covered.
My case is a little different. The popping started after I fixed a large vacuum leak (UIM to brake booster hose).
Now for the rest of the story-Last week when it was really cold here in Michigan 10*F, I started the car and the used a little accel pedal to allow it to warm up (no BAC or ACV). It did not want to idle so I thought maybe it was the temps. I ran it for a couple minutes and still could not get it to idle, so I shut it down. Thought it may have been a clogged injector, because it seemed to run fine when I revved it above 3800. I removed the UIM and found the brake booster hose broke off at the fitting. I replaced the hose. Started the car and everything was back to normal, except for the popping noise on decel.
My set up
88 T2
6 port long block, mild street port
S5 Hybrid turbo
Stock DP, Gutted cat
Unknown pre-silencer
CS 3" cat back
TPS set to .94 volts
Fuel pressure 45PSI with vacuum hose removed
15in vacuum @900 rpm idle
My question, If the noise is normal(according to the threads I read), why didn't it make this noise before. Why would the popping start after the vacuum leak repair and not before?
My case is a little different. The popping started after I fixed a large vacuum leak (UIM to brake booster hose).
Now for the rest of the story-Last week when it was really cold here in Michigan 10*F, I started the car and the used a little accel pedal to allow it to warm up (no BAC or ACV). It did not want to idle so I thought maybe it was the temps. I ran it for a couple minutes and still could not get it to idle, so I shut it down. Thought it may have been a clogged injector, because it seemed to run fine when I revved it above 3800. I removed the UIM and found the brake booster hose broke off at the fitting. I replaced the hose. Started the car and everything was back to normal, except for the popping noise on decel.
My set up
88 T2
6 port long block, mild street port
S5 Hybrid turbo
Stock DP, Gutted cat
Unknown pre-silencer
CS 3" cat back
TPS set to .94 volts
Fuel pressure 45PSI with vacuum hose removed
15in vacuum @900 rpm idle
My question, If the noise is normal(according to the threads I read), why didn't it make this noise before. Why would the popping start after the vacuum leak repair and not before?
#4
Banned. I got OWNED!!!
iTrader: (17)
Sounds like a backfire to me. Do you have cats on your car? I do and I get alot pf muffled backfires.
http://uk.youtube.com/watch?v=9AbgUfbyHe4
http://uk.youtube.com/watch?v=9AbgUfbyHe4
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