2003-04 Mach 1 Registry Owners Club  


Go Back   2003-04 Mach 1 Registry Owners Club > "GO" Discussions > Fluid Systems (coolant, oil, fuel)

Reply
 
Thread Tools Display Modes
Old 02-27-2017, 02:20 PM   #1
Procharged2k3
Registered User
 
Procharged2k3's Avatar
 
Join Date: Jun 2015
Location: St. Louis, MO
Posts: 279
Frequently get hesitation for half a second

ONE OF THESE DAYS this stupid car will be all sorted out... I hope.

Ever since installing the Cobra short block, adding Cobra dual pump tank and getting a new tune, my car has occasionally completely stopped supplying fuel and/or spark for a half second... then it comes right back like normal. This used to just happen while cruising normally. Not getting on the throttle.

Now it's doing it when I get on the throttle half of the time. My tuner is checking it out. Anybody here seen this happen before? It almost feels like it thinks it hitting redline and cutting fuel even though it's nowhere close to redline.

I do have the correct BAP for dual pumps. (40 amp)
Procharged2k3 is offline   Reply With Quote
Old 02-27-2017, 02:44 PM   #2
Uloset
Fastest Mach 1 Somewhere
 
Uloset's Avatar
 
Join Date: Mar 2004
Location: Trenton, NJ
Posts: 1,302
Re: Frequently get hesitation for half a second

I've had this problem with my car for years, although it happens sporadically. I original though it was the fuel pump, well the original took a dump and I replaced it with a focus SVT unit. Unfortunate, I still get the same thing happening every once in a while.

If I remember correctly someone claimed it could be moisture that found its way to the spark plugs. You could try pulling the ignition covers and giving all the plugs a shot of compressed air. Honestly I've never tried this fix as it happens so rarely that I forget about it until the next time.
__________________
"It is not necessary to understand things in order to argue about them"

I have a problem every time I pull up to some ricer a strange buzzing noise comes from behind me, any clue what it could be?
Uloset is online now   Reply With Quote
Old 02-27-2017, 02:57 PM   #3
Procharged2k3
Registered User
 
Procharged2k3's Avatar
 
Join Date: Jun 2015
Location: St. Louis, MO
Posts: 279
Re: Frequently get hesitation for half a second

Hmm, wouldn't it only affect certain plugs in that case so it would still fire but not on all cyls? What's happening on mine is it feels like the computer just tells the entire engine to stop firing or it's not activating the injectors.

It's starting to happen really often. Like twice during the same 50 mile drive.
Procharged2k3 is offline   Reply With Quote
Old 02-27-2017, 03:11 PM   #4
fastlane
Registered User
 
Join Date: Mar 2011
Location: Fort Worth, TX
Posts: 209
Re: Frequently get hesitation for half a second

Did you do the PPRV delete? That can cause hesitation as well.
fastlane is offline   Reply With Quote
Old 02-27-2017, 03:30 PM   #5
DSG2003Mach1
700 HP Mach
 
DSG2003Mach1's Avatar
 
Join Date: Nov 2003
Location: Orlando, FL
Posts: 8,384
Re: Frequently get hesitation for half a second

moisture in the coil packs can cause a misfire but I think thats pretty consistent when it happens.

if youre logging fuel and spark I would think it would be pretty easy to see in a log
__________________
03 dsg mach1 - MPR built 9.5:1 motor, D1, cams, ported intake, full exhaust, magnum t56, built rear, E85 etc...

'12 F150 FX2 Supercrew with Ecoboost daily beater
DSG2003Mach1 is offline   Reply With Quote
Old 02-27-2017, 03:31 PM   #6
Procharged2k3
Registered User
 
Procharged2k3's Avatar
 
Join Date: Jun 2015
Location: St. Louis, MO
Posts: 279
Re: Frequently get hesitation for half a second

Quote:
Originally Posted by fastlane View Post
Did you do the PPRV delete? That can cause hesitation as well.
I actually don't know, isn't that on the fuel tank? I'm not sure if the shop did that when installing it or if maybe it was already done on this used tank. That would make a bit of sense, as the entire issue started when the tank was put in.
Procharged2k3 is offline   Reply With Quote
Old 02-27-2017, 03:58 PM   #7
Procharged2k3
Registered User
 
Procharged2k3's Avatar
 
Join Date: Jun 2015
Location: St. Louis, MO
Posts: 279
Re: Frequently get hesitation for half a second

This is more than "hesitation" though, I probably shouldn't have used that word in the thread title. It's more of just a total and instant cut-off of ignition for half a second, then it returns like normal...
Procharged2k3 is offline   Reply With Quote
Old 02-27-2017, 04:18 PM   #8
DSG2003Mach1
700 HP Mach
 
DSG2003Mach1's Avatar
 
Join Date: Nov 2003
Location: Orlando, FL
Posts: 8,384
Re: Frequently get hesitation for half a second

yes the PPRV is in the fuel tank, its part of the pump assembly before it gets to the hat. Theres a hose off of each pump, they Y together and theres a one way check ball, it keeps fuel in the line when you turn the car off for quicker start up. Its a restriction so many people delete it for more headroom but there have been hesitation issues with it in place
__________________
03 dsg mach1 - MPR built 9.5:1 motor, D1, cams, ported intake, full exhaust, magnum t56, built rear, E85 etc...

'12 F150 FX2 Supercrew with Ecoboost daily beater
DSG2003Mach1 is offline   Reply With Quote
Old 02-28-2017, 01:23 AM   #9
01yellerCobra
Registered User
 
Join Date: Jan 2013
Location: San Diego, CA
Posts: 1,104
There's a spot in the tune where your tuner can put a limit on the fuel pressure the FRPS senses. He also needs to change a couple values.

I really need to write these down so I don't have to look at my tune every time. But a lot of the time the hesitation can be tuned out. Depending on how close to maxed your fuel system is.
__________________
New Ride:
2004 Mystichrome Cobra-Accufab SBTB and plenum, Steeda 2.8" upper, Bassani X, Borla Stingers, Mcleod RXT, MGW shifter, Level 5 halfshafts, chrome FR500's, Stiffler's FIT system and DS safety loop, GT pumps, BA3000, tuned by owner
01yellerCobra is offline   Reply With Quote
Old 02-28-2017, 10:28 AM   #10
Procharged2k3
Registered User
 
Procharged2k3's Avatar
 
Join Date: Jun 2015
Location: St. Louis, MO
Posts: 279
Re: Frequently get hesitation for half a second

Just mentioned the PPRV delete to my tuner... he texted back saying he already tried it, lol. Crap.
Procharged2k3 is offline   Reply With Quote
Old 02-28-2017, 01:06 PM   #11
Uloset
Fastest Mach 1 Somewhere
 
Uloset's Avatar
 
Join Date: Mar 2004
Location: Trenton, NJ
Posts: 1,302
Re: Frequently get hesitation for half a second

Quote:
Originally Posted by Procharged2k3 View Post
Hmm, wouldn't it only affect certain plugs in that case so it would still fire but not on all cyls? What's happening on mine is it feels like the computer just tells the entire engine to stop firing or it's not activating the injectors.

It's starting to happen really often. Like twice during the same 50 mile drive.
Yea, I know the feeling, almost like someone tapped the brakes real quick and it jolts the entire car. I only experience it while cruising in 5th never during acceleration runs, which makes me think it is ignition related rather than fuel.
__________________
"It is not necessary to understand things in order to argue about them"

I have a problem every time I pull up to some ricer a strange buzzing noise comes from behind me, any clue what it could be?
Uloset is online now   Reply With Quote
Old 02-28-2017, 02:49 PM   #12
Procharged2k3
Registered User
 
Procharged2k3's Avatar
 
Join Date: Jun 2015
Location: St. Louis, MO
Posts: 279
Re: Frequently get hesitation for half a second

Yeah it feels exactly like that. My tuner says he'll figure it out, I'll let you know what he comes up with when he does. It's Bob Monks (aka Bobcat), he's a wizard. Very well known around the midwest, one of the best Ford guys around. No doubt he'll find the problem eventually.

I thought it doesn't hurt to see if anybody online already ran into the same issue and found the solution though.

Looking forward to this car finally being at 100% in time for spring.
Procharged2k3 is offline   Reply With Quote
Old 02-28-2017, 09:57 PM   #13
hecdel40
Registered User
 
Join Date: May 2008
Location: Waveland MS
Posts: 326
Re: Frequently get hesitation for half a second

I had the same problem at WOT switching from 3rd year to 4th, and all it was the BPV blowing air to the MAF sensor and throwing the ECU out of wack. Once I rerouted through BPV dump problem solve. I know my car is supercharge but I hope this help you out.
hecdel40 is offline   Reply With Quote
Old 03-01-2017, 10:37 AM   #14
Procharged2k3
Registered User
 
Procharged2k3's Avatar
 
Join Date: Jun 2015
Location: St. Louis, MO
Posts: 279
Re: Frequently get hesitation for half a second

My car's supercharged too, but the BPV is vented to atmosphere. It also used to happen sometimes even when driving like a sane person and just cruising along maintaining speed though. Something else could be up with the MAF sensor though that confuses the computer! Hmm...
Procharged2k3 is offline   Reply With Quote
Old 03-01-2017, 10:37 AM   #15
Uloset
Fastest Mach 1 Somewhere
 
Uloset's Avatar
 
Join Date: Mar 2004
Location: Trenton, NJ
Posts: 1,302
Re: Frequently get hesitation for half a second

Quote:
Originally Posted by hecdel40 View Post
I had the same problem at WOT switching from 3rd year to 4th, and all it was the BPV blowing air to the MAF sensor and throwing the ECU out of wack. Once I rerouted through BPV dump problem solve. I know my car is supercharge but I hope this help you out.
Hmmm I wonder if it is something as stupid as a dirty MAF sensor, but you'd think that would show up when logging fuel/spark.
__________________
"It is not necessary to understand things in order to argue about them"

I have a problem every time I pull up to some ricer a strange buzzing noise comes from behind me, any clue what it could be?
Uloset is online now   Reply With Quote
Old 03-01-2017, 10:45 AM   #16
sutyak
it's soo-tack
 
sutyak's Avatar
 
Join Date: Nov 2002
Location: Fairmont, WV
Posts: 2,082
Re: Frequently get hesitation for half a second

I used to have a similar issue with my turbo Focus when water got into the intake. It would blow onto the MAF and momentarily stall, but that was only in boost. I eventually moved the air filter.
Similar hesitations have been lean spots in part throttle and fixed through tweaks of the MTF table in the tune. Issues with the tune are usually consistently reproduce-able and not random. I've found random issues point to physical faults, meaning not in the tune.
__________________
mark
2004 DSG Mach 1. Built motor. Turbo. 667whp
2006 Sonic Blue Focus. Built motor. Turbo. 12.4 @ 115mph (sold)
2003 DSG Mach 1. 12.65 @ 106 (sold)

Last edited by sutyak; 03-01-2017 at 11:06 AM.
sutyak is offline   Reply With Quote
Old 03-10-2017, 09:52 AM   #17
Procharged2k3
Registered User
 
Procharged2k3's Avatar
 
Join Date: Jun 2015
Location: St. Louis, MO
Posts: 279
Re: Frequently get hesitation for half a second

So apparently it was something about fuel pump voltage in the tune. Got the car back last night and so far no more hesitations.
Procharged2k3 is offline   Reply With Quote
Old 03-10-2017, 10:14 AM   #18
DSG2003Mach1
700 HP Mach
 
DSG2003Mach1's Avatar
 
Join Date: Nov 2003
Location: Orlando, FL
Posts: 8,384
Re: Frequently get hesitation for half a second

nice, at least it wasnt something you had to buy a buncha crap to fix
__________________
03 dsg mach1 - MPR built 9.5:1 motor, D1, cams, ported intake, full exhaust, magnum t56, built rear, E85 etc...

'12 F150 FX2 Supercrew with Ecoboost daily beater
DSG2003Mach1 is offline   Reply With Quote
Old 03-10-2017, 11:29 AM   #19
sutyak
it's soo-tack
 
sutyak's Avatar
 
Join Date: Nov 2002
Location: Fairmont, WV
Posts: 2,082
Re: Frequently get hesitation for half a second

Quote:
Originally Posted by Procharged2k3 View Post
So apparently it was something about fuel pump voltage in the tune. Got the car back last night and so far no more hesitations.
Great to hear.
__________________
mark
2004 DSG Mach 1. Built motor. Turbo. 667whp
2006 Sonic Blue Focus. Built motor. Turbo. 12.4 @ 115mph (sold)
2003 DSG Mach 1. 12.65 @ 106 (sold)
sutyak is offline   Reply With Quote
Old 03-16-2017, 02:12 PM   #20
Uloset
Fastest Mach 1 Somewhere
 
Uloset's Avatar
 
Join Date: Mar 2004
Location: Trenton, NJ
Posts: 1,302
Re: Frequently get hesitation for half a second

Good news for you, unfortunately not a answer for me as the car is on the stock tune, only mod being SLP LM1's.
__________________
"It is not necessary to understand things in order to argue about them"

I have a problem every time I pull up to some ricer a strange buzzing noise comes from behind me, any clue what it could be?
Uloset is online now   Reply With Quote
Old 03-16-2017, 10:59 PM   #21
01yellerCobra
Registered User
 
Join Date: Jan 2013
Location: San Diego, CA
Posts: 1,104
Quote:
Originally Posted by Uloset View Post
Good news for you, unfortunately not a answer for me as the car is on the stock tune, only mod being SLP LM1's.
Start with the basics. Clean the MAF, new plugs, fuel filter, etc.
__________________
New Ride:
2004 Mystichrome Cobra-Accufab SBTB and plenum, Steeda 2.8" upper, Bassani X, Borla Stingers, Mcleod RXT, MGW shifter, Level 5 halfshafts, chrome FR500's, Stiffler's FIT system and DS safety loop, GT pumps, BA3000, tuned by owner
01yellerCobra is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 12:31 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
(c) 2002-2013 Mach1Registry.com

<