low end problems - 2003-04 Mach 1 Registry Owners Club

blue 04 · 03-02-2011, 07:18 PM

Hey guys what's going up, I have a 04 mach 1 with a 12lb procharger on it and i'm having a bad hesitation or almost a miss at low rpm and med. throttle. car runs great at full throttle but not sure what's going on during basic driving. Car has sct tune and mass air 8.5-1 manley pistons and rods 42lb. inj. keene bell boost to pump. i'm thinking tps. or bad plug??? and idea's would be great thanks... blue 04

icutice2 · 03-04-2011, 11:21 PM

Quote:

Originally Posted by blue 04

Hey guys what's going up, I have a 04 mach 1 with a 12lb procharger on it and i'm having a bad hesitation or almost a miss at low rpm and med. throttle. car runs great at full throttle but not sure what's going on during basic driving. Car has sct tune and mass air 8.5-1 manley pistons and rods 42lb. inj. keene bell boost to pump. i'm thinking tps. or bad plug??? and idea's would be great thanks... blue 04

I had similar thing happen and ended up being fuel filter and boost a pump fuse was blown

blue 04 · 03-05-2011, 11:07 AM

thanks i'll take a look at those things

ASH302 · 03-06-2011, 06:25 AM

Quote:

Originally Posted by blue 04

thanks i'll take a look at those things

seems like it can be sometimes the most simplest stuff that will get you

ASh

Scott McClure · 03-06-2011, 07:48 AM

Change your plugs to NGK TR6's if you haven't already and see if that helps at all. They're cheap enough so it can't hurt.

torched04 · 03-06-2011, 12:37 PM

Quote:

Originally Posted by Scott McClure

Change your plugs to NGK TR6's if you haven't already and see if that helps at all. They're cheap enough so it can't hurt.

Just watch the copper version of these plugs as I know on my eaton setup they would cause a low rpm buck/hesitation. I switched to NGK TR6ix plugs and they cleaned up all those issues.

This was going to be my suggestion also check the plugs.

jchambers · 03-06-2011, 12:51 PM

Quote:

Originally Posted by blue 04

Hey guys what's going up, I have a 04 mach 1 with a 12lb procharger on it and i'm having a bad hesitation or almost a miss at low rpm and med. throttle. car runs great at full throttle but not sure what's going on during basic driving. Car has sct tune and mass air 8.5-1 manley pistons and rods 42lb. inj. keene bell boost to pump. i'm thinking tps. or bad plug??? and idea's would be great thanks... blue 04

Make sure your bypass valve is working. The PC bypass valves are notorious for developing a hole in the diaphram which leads to a vacuum leak and the bypass not opening under manifold vacuum.

Scott McClure · 03-06-2011, 01:10 PM

The NGK TR6 plugs I'm refering too are part number 4177 I think.

blue 04 · 03-11-2011, 08:16 PM

hey guys been working alot at work, thanks again for all the suggestions I will let everyone know what happens when I get crackn'n on this thanks again blue 04...

Thor · 03-12-2011, 12:38 AM

I had a similar problem; hesitation, bucking/jumping at low rpms.

While I don't recall the specifics, it turned out to be the tuner. He kept telling me it was mechanical and I called him on his B.S. (Testament to this, I later learned he blew four other motors.)

Different tuner, different results and it certainly wasn't mechanical; It was the previous tuner's inability to properly tune...

blue 04 · 03-12-2011, 10:35 AM

hey, how would i know if the bypass IS working properly, what should I look for or listen for?

03-02-2011, 07:18 PM	#1
blue 04 Registered User Join Date: Feb 2011 Location: manhattan Posts: 5	low end problems Hey guys what's going up, I have a 04 mach 1 with a 12lb procharger on it and i'm having a bad hesitation or almost a miss at low rpm and med. throttle. car runs great at full throttle but not sure what's going on during basic driving. Car has sct tune and mass air 8.5-1 manley pistons and rods 42lb. inj. keene bell boost to pump. i'm thinking tps. or bad plug??? and idea's would be great thanks... blue 04

03-05-2011, 11:07 AM	#3
blue 04 Registered User Join Date: Feb 2011 Location: manhattan Posts: 5	Re: low end problems thanks i'll take a look at those things

03-06-2011, 07:48 AM	#5
Scott McClure Mach1 member Join Date: Aug 2003 Location: East Haven, CT Posts: 3,349	Re: low end problems Change your plugs to NGK TR6's if you haven't already and see if that helps at all. They're cheap enough so it can't hurt. __________________ 2011 Mustang GT Grabber Blue Automatic 2003 Mach 1 Whipple 2.3 718 rwhp 735 rwtq @25 psi SOLD

03-06-2011, 01:10 PM	#8
Scott McClure Mach1 member Join Date: Aug 2003 Location: East Haven, CT Posts: 3,349	Re: low end problems The NGK TR6 plugs I'm refering too are part number 4177 I think. __________________ 2011 Mustang GT Grabber Blue Automatic 2003 Mach 1 Whipple 2.3 718 rwhp 735 rwtq @25 psi SOLD

03-11-2011, 08:16 PM	#9
blue 04 Registered User Join Date: Feb 2011 Location: manhattan Posts: 5	Re: low end problems hey guys been working alot at work, thanks again for all the suggestions I will let everyone know what happens when I get crackn'n on this thanks again blue 04...

03-12-2011, 12:38 AM	#10
Thor "God of Thunder" Join Date: Jan 2007 Location: DC Posts: 1,076	Re: low end problems I had a similar problem; hesitation, bucking/jumping at low rpms. While I don't recall the specifics, it turned out to be the tuner. He kept telling me it was mechanical and I called him on his B.S. (Testament to this, I later learned he blew four other motors.) Different tuner, different results and it certainly wasn't mechanical; It was the previous tuner's inability to properly tune...

03-12-2011, 10:35 AM	#11
blue 04 Registered User Join Date: Feb 2011 Location: manhattan Posts: 5	Re: low end problems hey, how would i know if the bypass IS working properly, what should I look for or listen for?

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