Rough idle, flatspot in accelerator.
Thread Starter
Joined: Jul 2008
Posts: 2
Likes: 0
Rough idle, flatspot in accelerator.
I have a 98 durango, was great changed Air intake, wires. plugs, coil. drove it for 1000 miles then it started idling very rough and during acceleration there was a flat spot, engine will die if I leave it at that throttle position ( 3.5 volts at wide o), I changed the TPS, and the new one is still only 3.6 at W/o. I replaced the plentum plate and gasket, and intake gasket, all with no improvement. If I accelerate slowly I can take it up to 5000 rpm with out the flat spot. today I had the injectors cleaned, and I changed the fuel filter/ regulator, all with no improvement. I have checked the cam position sensor, crank position sensor, all ok, so now I left with very few alternatives. take it to the dealer and pay another 150 just t look at it. Is this a PCM, or ECM problem. I am lost and need help. thanks J.C.
THE ULTI-MOD
Joined: Jan 2007
Posts: 19,797
Likes: 36
From: Union NJ
RE: Rough idle, flatspot in accelerator.
what kind of plugs did you put into it???
a hint - if you put Bosch platinums into it they tend to cause problems in these trucks, take them out and replace them w/ champion copper plugs and chances are the problem will be fixed
a hint - if you put Bosch platinums into it they tend to cause problems in these trucks, take them out and replace them w/ champion copper plugs and chances are the problem will be fixed
Record Breaker
Joined: Nov 2006
Posts: 1,222
Likes: 1
From: Ohio
RE: Rough idle, flatspot in accelerator.
Bronco:
On a rig that old, you could be looking at a vacuum leak also. Carefully look and check every piece of vacuum hose you can find. Possibly a hose that was on its way out finally went, or one that had to be moved for the recent work has popped loose from its connector.
Don
On a rig that old, you could be looking at a vacuum leak also. Carefully look and check every piece of vacuum hose you can find. Possibly a hose that was on its way out finally went, or one that had to be moved for the recent work has popped loose from its connector.
Don
Thread Starter
Joined: Jul 2008
Posts: 2
Likes: 0
RE: Rough idle, flatspot in accelerator.
In answer to both questions:
1. I used accel plugs, wires, coil, cap and rotor. I can pick up some champion plugs they are pretty cheap and it beats having to shellout 150 at the dealer if it works. if it doesent then i have a set of new plugs for my next tune-up
2. I have a vacume guage and when I hook it up while it is running I get all green. no real fluctuations. It acts like it is getting lean, that is why I focused so much on fuel. My fuel pressure remains between 48-52 when I am reving or idling.
I have the hat accel coil it might have upset the pcm, If I still had the old one I would swap it out and see if that helped.
1. I used accel plugs, wires, coil, cap and rotor. I can pick up some champion plugs they are pretty cheap and it beats having to shellout 150 at the dealer if it works. if it doesent then i have a set of new plugs for my next tune-up
2. I have a vacume guage and when I hook it up while it is running I get all green. no real fluctuations. It acts like it is getting lean, that is why I focused so much on fuel. My fuel pressure remains between 48-52 when I am reving or idling.
I have the hat accel coil it might have upset the pcm, If I still had the old one I would swap it out and see if that helped.