Engine hesitation, no trouble codes
#1
Engine hesitation, no trouble codes
So not sure what's going on... 2003 Disco II
Under hard acceleration it seems fine, but under light acceleration the engine seems to hesitate for a second. Seems to happen around the same RPMs every time, don't remember off the top of my head but I want to say maybe 2000 and again around 2050.
Like I said, light acceleration. Truck pulls, then goes just a little flat, then pulls, then flat, then does fine after that. No funny noises or knocking, doesn't sound like a misfire. Idles perfect.
That being said - I hooked it up to the Ultra Gauge, and it does show a "Pending" P1451. The Service Engine light never does come on, so the code doesn't ever seem to get "official".
If the weather stays nice tomorrow I'll probably do a compression test.
Any suggestions?
Thanks guys.
-Tim
Under hard acceleration it seems fine, but under light acceleration the engine seems to hesitate for a second. Seems to happen around the same RPMs every time, don't remember off the top of my head but I want to say maybe 2000 and again around 2050.
Like I said, light acceleration. Truck pulls, then goes just a little flat, then pulls, then flat, then does fine after that. No funny noises or knocking, doesn't sound like a misfire. Idles perfect.
That being said - I hooked it up to the Ultra Gauge, and it does show a "Pending" P1451. The Service Engine light never does come on, so the code doesn't ever seem to get "official".
If the weather stays nice tomorrow I'll probably do a compression test.
Any suggestions?
Thanks guys.
-Tim
Last edited by Tim P.; 01-19-2013 at 07:00 PM.
#2
#7
Thanks guys - Plugs and wires were just redone a few weeks ago. It does feel more like a flat spot in the accelerator than misfire, how do I go about checking/replacing the TPS?
I don't hear any obvious vacuum/blower leaks under the hood, will look at the SAI closer today.
Buzz - Any specific trouble spots I should look for on the Evap system?
I don't hear any obvious vacuum/blower leaks under the hood, will look at the SAI closer today.
Buzz - Any specific trouble spots I should look for on the Evap system?
#10
Just wanted to follow up on this.
While getting ready to pull the spark plugs, one of the spark plug boots came off but left the metal spark plug clip on the plug. The wire was basically ripped right off. It looks like it had been that way for a while, the plug boot was burnt right through where the coil was apparently arcing into the engine block.
I'm guessing the previous owner did a tune up, and pulled the boots off by the wire instead of the boot itself. Checked the rest, and found one other boot that did the same thing.
I ordered a set of Mangacore wires, but in the meantime I needed to get this thing back up and running.
I went down to NAPA and picked up a new boot and clip for about $2.50, trimmed 1/2" off the wire to expose new core, and had just enough length to re-install them.
Took it for a test-drive, and it's running pretty good now. No noticeable hesitation. Will post after I get a better drive in later this evening.
-Tim
While getting ready to pull the spark plugs, one of the spark plug boots came off but left the metal spark plug clip on the plug. The wire was basically ripped right off. It looks like it had been that way for a while, the plug boot was burnt right through where the coil was apparently arcing into the engine block.
I'm guessing the previous owner did a tune up, and pulled the boots off by the wire instead of the boot itself. Checked the rest, and found one other boot that did the same thing.
I ordered a set of Mangacore wires, but in the meantime I needed to get this thing back up and running.
I went down to NAPA and picked up a new boot and clip for about $2.50, trimmed 1/2" off the wire to expose new core, and had just enough length to re-install them.
Took it for a test-drive, and it's running pretty good now. No noticeable hesitation. Will post after I get a better drive in later this evening.
-Tim
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