Register Log In

Contour Enthusiasts Group Archives Forums General Troubleshooting Severe hesitation at 2500 and 4000

Print Thread

Severe hesitation at 2500 and 4000 #1430482 11/06/05 06:14 PM
Joined: Nov 2004 Posts: 273 Iowa State University P PurpleMystique OP CEG\'er
OP PurpleMystique CEG\'er P Joined: Nov 2004 Posts: 273 Iowa State University	My car: '96 Mystique Duratech ATX. 87,000 miles, bone stock. New upstream O2 sensors, not so great downstream ones Brand new fuel pump, kinda noisy Almost completely out of gas This happened for the first time this morning. It was fine on my way to church, but as I was leaving, I floored it. Right at 2500, the engine hesitated like i just took my foot off of the gas, the reengaged until 4000, where it did exactly the same thing, then finally went through and made it to second gear. I tried it a couple more times, and it didn't happen every time i floored it in first, but it seemed to only happen in first, and always at those two RPM levels. After I filled up with gas, I drove around for a while, and it didn't happen again. I'm reeeeally hoping this is not the transmission, it's only got 87K on it. A couple weeks ago I took the car in for a CEL, turns out it was running lean and the fuel pressure was low, so the same mechanic that replaced both O2 sensors last summer put in a new fuel pump. He also mentioned that after driving around a bit with the computer hooked up he saw the downstream O2 sensors were firing fairly slow and would need replacing very soon. I'm hoping something besides tranny failure is causing this, what do you guys think? "Mod your car tastefully because other people have to look at it." -Me

Re: Severe hesitation at 2500 and 4000 #1430483 11/06/05 06:30 PM
Joined: Sep 2002 Posts: 2,445 Pacific NW, USA B Beowulf Hard-core CEG\'er
Beowulf Hard-core CEG\'er B Joined: Sep 2002 Posts: 2,445 Pacific NW, USA	Originally posted by PurpleMystique: My car: '96 Mystique Duratech ATX. 87,000 miles, bone stock. New upstream O2 sensors, not so great downstream ones Brand new fuel pump, kinda noisy Almost completely out of gas This happened for the first time this morning. It was fine on my way to church, but as I was leaving, I floored it. Right at 2500, the engine hesitated like i just took my foot off of the gas, the reengaged until 4000, where it did exactly the same thing, then finally went through and made it to second gear. I tried it a couple more times, and it didn't happen every time i floored it in first, but it seemed to only happen in first, and always at those two RPM levels. After I filled up with gas, I drove around for a while, and it didn't happen again. I'm reeeeally hoping this is not the transmission, it's only got 87K on it. A couple weeks ago I took the car in for a CEL, turns out it was running lean and the fuel pressure was low, so the same mechanic that replaced both O2 sensors last summer put in a new fuel pump. He also mentioned that after driving around a bit with the computer hooked up he saw the downstream O2 sensors were firing fairly slow and would need replacing very soon. I'm hoping something besides tranny failure is causing this, what do you guys think? What did you find when you searched? Oh, and this is God telling you to stop going to church. 2000 Contour SE Sport Originator of the Beowulf Headlight Mod and the Beowulf CAI

Re: Severe hesitation at 2500 and 4000 #1430484 11/06/05 07:21 PM
Joined: Nov 2004 Posts: 273 Iowa State University P PurpleMystique OP CEG\'er
OP PurpleMystique CEG\'er P Joined: Nov 2004 Posts: 273 Iowa State University	The threads I came up said plugs, plug gap, wires, or exhaust. I got all new plugs this summer so I'm guess that's not it, and the exhaust stuff would cause a CEL, so I don't know if that isn't the problem or I just haven't gotten the light yet. It just worries me because it was always at those exact RPM's. "Mod your car tastefully because other people have to look at it." -Me

Re: Severe hesitation at 2500 and 4000 #1430485 11/07/05 12:17 AM
Joined: Jun 2005 Posts: 5,345 Virginia, USA T Tony2005 Addicted CEG\'er
Tony2005 Addicted CEG\'er T Joined: Jun 2005 Posts: 5,345 Virginia, USA	Originally posted by PurpleMystique: ...Almost completely out of gas ... After I filled up with gas, I drove around for a while, and it didn't happen again. ... If it happens again when you have gas, change the fuel filter and post any CEL codes you have. If it happens when you completely out of gas, it is probably the "crud" from the bottom of the tank clogging up the filters. "Always do the cheap and easy ones first." 1996 V6 ATX 96K miles

Re: Severe hesitation at 2500 and 4000 #1430486 11/07/05 01:08 AM
Joined: Nov 2004 Posts: 273 Iowa State University P PurpleMystique OP CEG\'er
OP PurpleMystique CEG\'er P Joined: Nov 2004 Posts: 273 Iowa State University	The filter was replaced along with the pump, so that's not it. I drove a lot tonight, and it didn't happen at all, so I'm hoping it was something along those lines. "Mod your car tastefully because other people have to look at it." -Me

Re: Severe hesitation at 2500 and 4000 #1430487 11/07/05 07:02 AM
Joined: Nov 2004 Posts: 273 Iowa State University P PurpleMystique OP CEG\'er
OP PurpleMystique CEG\'er P Joined: Nov 2004 Posts: 273 Iowa State University	I can see where some garbage could cause this, but why would it be exactly at 2500 and 4000? "Mod your car tastefully because other people have to look at it." -Me

Re: Severe hesitation at 2500 and 4000 #1430488 11/07/05 02:30 PM
Joined: Jun 2005 Posts: 5,345 Virginia, USA T Tony2005 Addicted CEG\'er
Tony2005 Addicted CEG\'er T Joined: Jun 2005 Posts: 5,345 Virginia, USA	Originally posted by PurpleMystique: ..but why would it be exactly at 2500 and 4000? Probably not always exactly at those RPMs but I would check the air filter and clean the MAF sensor. http://www.contour.org/mods/mods.php?s=howto&displayid=36 "Always do the cheap and easy ones first." 1996 V6 ATX 96K miles

Moderated by horseydug_dup1, Ray_dup1

Link Copied to Clipboard

Powered by UBB.threads™ PHP Forum Software 7.7.5