This is topic Possible lean pop? in forum Tech Talk at Northern California Ford Owners  .


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Posted by 86xchpstang (Member # 11800) on :
 
So I think I'm having lean pop problems! The car when it's cold has very rough idle, and when I drive it in low rpms it seems to hesitate and popping is coming from the intake. When I get in the throttle it runs fine . I have h/c/I, CAI, injectors, fuel pump, tune, long tube headers. I have replaced, egr valve, egr position sensor, IAC valve, egr valve vacuum control sensor.

I've been doing a lot of reading and I'm thinking it's either a vacuum leak or maybe the coolant temp sensor? I'm hoping to get some better info on the ordeal!

It's an 86 lx
 
Posted by Blow_U_In_Reverse (Member # 12298) on :
 
was the car converted to MAF? And does the problem go away once the car is warmed up?
 
Posted by Marks93 (Member # 11130) on :
 
When this started happening, did you do anything to the car prior to this?

First off, run codes. Even if your CEL didn't come on, run the codes and see if anything comes up.

Sounds like it could be timing or a vacuum leak to me. Maybe MAF needs cleaning?
 
Posted by 86xchpstang (Member # 11800) on :
 
Car still does it when it's warmed up just not as bad. Yes car is converted to maf. I have cleaned the maf when I replaced all of the parts stated above. Only thing I can think of that I did to the car was put a phenolic intake spacer!?
 
Posted by JZTRK (Member # 7641) on :
 
pull the plugs and check them for actual lean condition. if so bump up the fuel pressure with an adjustable regulator also you will need a fuel pump rated 255 lph or above
 
Posted by 86xchpstang (Member # 11800) on :
 
I have a automotive 340lph and 49lb injectots!
 
Posted by NEIGHT (Member # 8741) on :
 
quote:
Originally posted by 86xchpstang:
Car still does it when it's warmed up just not as bad. Yes car is converted to maf. I have cleaned the maf when I replaced all of the parts stated above. Only thing I can think of that I did to the car was put a phenolic intake spacer!?
Did it do it before the spacer?
 
Posted by Marks93 (Member # 11130) on :
 
quote:
Originally posted by NEIGHT:
quote:
Originally posted by 86xchpstang:
Car still does it when it's warmed up just not as bad. Yes car is converted to maf. I have cleaned the maf when I replaced all of the parts stated above. Only thing I can think of that I did to the car was put a phenolic intake spacer!?
Did it do it before the spacer?
If not, perhaps one of your gaskets moved, is not sitting correctly or broke....or one of your vacuum lines is not hooked up or broken. Sounds like a vacuum problem to me.

Did you make sure all your connections are hooked back up after taking off the intake....TPS, EGR, small vacuum hoses....
How's your timing?

[ 2016-01-27, 02:53 PM: Message edited by: Marks93 ]
 
Posted by 86xchpstang (Member # 11800) on :
 
I'm thinking it's a vacuum leak as well. All hoses look hooked up properly. Just replaced egr and couple other things. I wanted to make a evap smoke machine to check my own vacuum. I don't have a garage and tools so I either have to take it to a friend's or a shop!
 
Posted by 86xchpstang (Member # 11800) on :
 
And no....... I don't remember it doing that b4 the spacer!
 




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