possible tranny issue???

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possible tranny issue??? - 5/9/2008 7:24:41 PM    daddy_bear_21   Posts: 32 Joined: 12/2/2007 Status: offline I've noticed an issue, I believe it to be related to the tranny. When driving at speeds in the 30-45 mph area, cruising at a steady speed, every now and then the truck seems to hesitate. It's almost like the engine is trying to die, but I take my foot off the gas pedal, and it runs fine. Is this a trans issue, any ideas? It doesnt feel like it's a trans slip, the RPM's have trouble staying up, they try to fall, but only when I have my foot on the gas. I floor it, and it takes a second, then is fine. Any help would be greatly appreciated. Bear Post #: 1

RE: possible tranny issue??? - 5/9/2008 7:31:27 PM    01dakota440   Posts: 49 Joined: 4/17/2008 From: williamsport pa Status: offline have you thought about the cat going bad (in reply to daddy_bear_21) Post #: 2

RE: possible tranny issue??? - 5/9/2008 7:35:16 PM    daddy_bear_21   Posts: 32 Joined: 12/2/2007 Status: offline would that cause an intermittent issue, like weeks/months apart? I would go for a cat replacement before a trans repair...LOL It's only happened 3 or 4 times since owning the truck... (in reply to 01dakota440) Post #: 3

RE: possible tranny issue??? - 5/9/2008 7:45:08 PM    01dakota440   Posts: 49 Joined: 4/17/2008 From: williamsport pa Status: offline well its hard to tell without actually being able to take a look at it. but on one of my 97 dakotas, the honey comb inside the cat kinda crumbled apart.  the pieces were to big to come out the pipe, and some times while just driving normal they would blow up against the exit if the cat and block the flow. but when i let off the gas it was fine. and when i would put it right to the foor, they would still block some flow but ther was enough exuast pressure that you wouldn't notice it. and depending on the angle that it was pushed into the pipe it might not block that much flow and you wouldn't have the hesitation.  so let me know what you find out (in reply to daddy_bear_21) Post #: 4

RE: possible tranny issue??? - 5/9/2008 9:25:55 PM    hydrashocker Posts: 1635 Joined: 6/12/2005 Status: offline Most likely the problem is the IAC sensor on the Throttle Body. Most of the time you can just clean it and re-install or replace it. More info on your rig is needed before we can give you correct info tho. Year, Engine, and anything else you got on it? _____________________________ 1998 Durango, 5.9L Built Motor Bored 20 Over P&P Heads, K&N Ram Air CAI MSD Ignition, 52MM Fastman TB, Built T-Case Custom Built Trans, Air Bags Magna Flow 3" Cat Back Exhaust Too Much To List! (in reply to 01dakota440) Post #: 5

RE: possible tranny issue??? - 5/10/2008 9:06:25 AM    daddy_bear_21   Posts: 32 Joined: 12/2/2007 Status: offline to me, the IAC/throttle body would be an oppositte problem, as I have had to clean these once already. That caused the motor to hesitate or die when I took my foot off the gas, this is a hesitation that occurs at low speeds/low rpm's. I have a 99 5.2 4x4, the throttle body has been cleaned, the trans fluid is full, and this even happened before any work was done by me. I have added nothing to it other than some injector cleaner, which was after the first incident. To me it seems almost like a trans issue, but I am willing to explore other options. How would I check the cat without removing it? The only reason I say trans, is the nature of the issue. It happens at 30-45 mph, with low rpms, I take my foot off the gas and things are fine. I can return to the fuel, and the hesitation is there, the rpm have trouble staying up. I can also floor it, and return to the low rpm's, and still get the same reaction. It will last for a few seconds to a few minutes, any suggestions will be greatly appreciated. Thank you in advance, Bear (in reply to hydrashocker) Post #: 6

RE: possible tranny issue??? - 5/10/2008 11:16:21 AM    01dakota440   Posts: 49 Joined: 4/17/2008 From: williamsport pa Status: offline bear you are right about the iac, it would rev real high if stuck open and if stuck closed it would be hard to start and keep running at idle. so anyway to check the cat without removing it, all i can think of is to get under the truck and bang on it with a hammer and see if you can hear the stuff ratteling. (in reply to daddy_bear_21) Post #: 7

RE: possible tranny issue??? - 5/10/2008 1:03:01 PM    hydrashocker Posts: 1635 Joined: 6/12/2005 Status: offline Not the best idea to ruin a CAT. Most muffler shops will preform a back pressure test for free. They drill a small hole in before the CAT and after to measure pressure. Do a search on back pressure under my name in here. Could be a TPS, speed, or output sensor as well. Have you done a fuel pressure test yet? _____________________________ 1998 Durango, 5.9L Built Motor Bored 20 Over P&P Heads, K&N Ram Air CAI MSD Ignition, 52MM Fastman TB, Built T-Case Custom Built Trans, Air Bags Magna Flow 3" Cat Back Exhaust Too Much To List! (in reply to 01dakota440) Post #: 8

RE: possible tranny issue??? - 5/10/2008 7:46:19 PM    hydrashocker Posts: 1635 Joined: 6/12/2005 Status: offline Bear, I don't want to give you bad advise. Do you think this is a *trans problem posibly a serious problem* or do you think it might be a smaller problem with the engine stumbling? < Message edited by hydrashocker -- 5/10/2008 7:54:51 PM > _____________________________ 1998 Durango, 5.9L Built Motor Bored 20 Over P&P Heads, K&N Ram Air CAI MSD Ignition, 52MM Fastman TB, Built T-Case Custom Built Trans, Air Bags Magna Flow 3" Cat Back Exhaust Too Much To List! (in reply to 01dakota440) Post #: 9

RE: possible tranny issue??? - 5/11/2008 8:14:44 PM    daddy_bear_21   Posts: 32 Joined: 12/2/2007 Status: offline I thought trans, as it seemed as if the trans was acting as if it were trying to lock up maybe? Talking to my father in law (a former mechanic), he does not believe it to be a trans issue, or cat issue. He believes it to be related to the fuel system possibly, or other issue in that manner. I will talk to my mechanic tomorrow and see what he thinks. Thank you for the help, Bear (in reply to hydrashocker) Post #: 10

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