Engine Piping At Idle

Dave34 · Jul 23, 2016

i have a 91 gt with a fcam gt40p heads and an efi intake with an elbow 76mm maf and a megasquirt ecu and the afr is good at idle but every 10 seconds it pops it doesn't do it when accelerating the wires are ford racing with 90 degree boots on both ends so they don't touch the headers and the plugs are new

stykthyn · Jul 23, 2016

@a91what Is our resident ms guru. He may be able to help. Almost sounds timing related.

Dave34 · Jul 23, 2016

I'll double check the timing

a91what · Jul 23, 2016

How long have you had the car running on the system. If I'm to help you at all I'm in need a data log and a copy of your tune file. Are you running this car in mass or speed density. If it's happening every 10 seconds that sounds like ignition log issue it may be happening as you run down the road and you don't even know it the RPM's will cover it up. Go ahead and look for our megasquirt help thread if you repost this problem a copy of your data log and your msq file then when I find an answer it'll be in the help thread for everyone to see and maybe we can help someone else that has this issue

Dave34 · Jul 23, 2016

I haven't been on the system long it's not fully tuned yet but the is I'm working on the part throttle and wide open now I'll data log and attach it

a91what · Jul 23, 2016

Dave34 said:
I haven't been on the system long it's not fully tuned yet but the is I'm working on the part throttle and wide open now I'll data log and attach it

Are you running speed density or mass air?

Dave34 · Jul 23, 2016

I use the internal map sensor in the ms not mass air

a91what · Jul 23, 2016

Unplug the maf sensor, remove it and never think twice. You are currently feeding the ms a signal it cannot use and there is the slight possibility this is the issue.

Dave34 · Jul 23, 2016

I have the sensor on the car but it's been unplugged I just have it there until I get a new intake

a91what · Jul 24, 2016

Sorry can I get a better description of the car and the issue. From what I gather you have a intake kinda like mine. But what is the poping? Is it very loud? Does it smell like fuel? Any discoloration on the exhaust tips?

Mine.

Dave34 · Jul 24, 2016

It's a 91 gt with a ms ecu cold air intake the same Intake as you 75mm throttle body 24 pound injectors f cam gt40p heads long tube headers and flow master mufflers off road x pipe at idle and crusing it makes a poping sound out of the exhaust but not on acceleration it's it sounds more like a misfire it's not a backfire

a91what · Jul 24, 2016

OK I still need a data log and a copy of your tune file for review.
It does sound ignition related, like the timing is retarded. How did you set the timing with the ms installed.

Dave34 · Jul 24, 2016

I think you're right my buddy was helping me install the ms and he did the timing I'll double check it on the ms

a91what · Jul 24, 2016

What you need to do is set the timing to "fixed" under the ignition settings. Then verify on the balancer. Don't forget to change it back to "use table".... don't pull the spout it no longer affects the timing.

Dave34 · Jul 24, 2016

Ok I'll check it then I'll data log soon but it's raining so I have to wait for the weather to clear up

a91what · Jul 24, 2016

Where are you from?

Dave34 · Jul 24, 2016

Ohio it's been raining most of the day

a91what · Jul 24, 2016

Here in Florida to.....

a91what · Jul 24, 2016

In the ms help thread here I have made a few videos on how to tune, set timing with Ms and a few other things... check it out if you have time

a91what · Jul 24, 2016

Find it here.
http://www.stangnet.com/mustang-forums/threads/steves-megasquirt-tunerstudio-help-thread.888730/

Engine Piping At Idle

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