Cruising Speed Chug!

runningONfumes · Jul 14, 2012

My 01 GT Automatic has been doing this weird chugging and jerking real hard while at cruising speed 35-55, or when the gas peddle is pressed down enough to maintain speed. It will do it some what slightly at highway speeds until the RPMs get over 2300 and it seems to smooth out after that.

I have no check engine light, and the trans was just rebuilt 6000 miles ago!

Has anyone experienced this or have any advice that can point me in the right direction? Thanks.

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wmburns · Jul 14, 2012

I recommend starting with the basics. Clean the MAF. New fuel filter. New PVC value. Check for vacuum leaks and exhaust leaks. Check all hoses especially the EVAP hoses and the lines leading to/from the DPFE sensor.

Then (and only then) look at the possibility this is excessive EGR flow. Pull and cap the vacuum line the EGR value. Does this improve performance? If so, replace the DPFE sensor first.

runningONfumes · Jul 15, 2012

OK, I'm going out this morning to tackle this thing. Thank you for the speedy reply! I'll keep you updated.

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runningONfumes · Jul 15, 2012

Update! Changed PCV valve, cleaned MAF and changed fuel filter. Checked vacuum lines and exaust is good no leaks. Much to my evail its now running worse. Rough idle and seems to be missing. Tone of the motor has seemed to change aswell, sounds throaty almost like its being choked.

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runningONfumes · Jul 15, 2012

Is this the DFPE?

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wmburns · Jul 15, 2012

The picture posted is the EGR solenoid. The DPFE is on the firewall. It has two small vacuum lines running from the EGR tube. It's usually flat and square.

runningONfumes · Jul 16, 2012

Alright thanks, I seen that right after I took that pic. I will unhooking the one that goes to the egr on my way home from work and see if it blows up! Hahaha.

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runningONfumes · Jul 16, 2012

Pulled the vacuum hose to the egr and I'm getting no vacuum at all from either end. No air movement. Is it supposed to be that way?

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runningONfumes · Jul 16, 2012

Well just got back from the test drive after pulling the vacuum hose from the DPFE. I drove it hard, soft, backwards and sideways and not one time did she spit, spudder, chug, or jerk.

Looks like I'll be picking up a new one on my lunch break tomorrow.

wmburns, thank you for your help and knowledge! We all love our mustangs and want them to run and look good. And when someone like you takes time out of your day to help us, it is greatly appreciated!

runningONfumes · Jul 21, 2012

Well, after 4 days and $102 for a DPFE sensor the 01 GT is at her old tricks again

I know the check engine light is working because of pulling the EGR value house to the sensor the light came on for the drive home I got a code for restricted flow.

Is changing the EGR Valve next on the list to be changed or could something be fouling the sensor?

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runningONfumes · Jul 26, 2012

This little annoying chug is really starting to get expensive. I have now cleaned the egr, no change, replaced it, no change. I'm all out of ideas.

I guess next step is plugs and COLs. Could I have a fuel system problem? I figure if it was an ignition problem I would be constant throughout all RPM ranges. Now I'm just shooting in the dark. Any other opinions would be great! Thanks guys!

fiveohwblow · Jul 27, 2012

Is it a violent chug? How have you pinpointed the trans?

Changed plugs?

runningONfumes · Jul 27, 2012

It sometimes is pretty harsh at lower speeds. And I just had the trans rebuilt around 6500 miles ago. I have not changed the plugs yet.

1fun281 · Jul 27, 2012

Ive had this same problem since ive owned the car i deleted IAC, changed all plugs and cop, deleted egr, changed intake manifold, pretty much only happens at a steady idle, im putting new injectors in it and a fuel pump if it doesnt change im going to live with it.

runningONfumes · Jul 29, 2012

Well yesterday and today I pulled the injecters off and cleaned them with kerosene and a soft toothbrush. WOW, Car is stronger and smoother than it was when I bought it. And I seafoamed it to while I was at it. Problem solved for now.

Brute03 · Aug 2, 2012

let us know how it holds up. I get a low-rpm buck/hesitation ever so often and i've checked or changed almost everything but the injectors

runningONfumes · Aug 3, 2012

We'll do! It was starting to get real frustrating for a while. So far it's been going good, I'm still getting an "off" tone in the exhaust, just don't sound like it used to before I started having that issue. Its almost sounds if their is water in the mufflers. That's just what it sounds like and I assure everyone who reads this that I do not have water in them! LOL. But I will sure keep you posted.

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