| nacradriver |
Tue Dec 30, 2014 3:44 pm |
|
When my engine is cold, it runs fine, but recently once the van warms up it gets a little bit of a buck, hesitation, and sluggish feel with the engine.. It makes “get me home power” but I would want to make any trips with it until fixed…
Here is what has been done so far…
> O2 sensor has been replaced…. Once this was done last week and she ran like top for about 150 miles, and seems to run a little better when I unplug the new sensor… can these things go bad that fast?
> Changed out the catalytic converter, this didn’t solve the problem… Had it sitting here since I bought the van waiting for the next smog inspection to install it… figured now would be a good time…
> Changed out the Temp II switch this past summer when I redid the cooling system… can these too go bad that fast? If that did go bad would this be causing a running rich situation?
> Cycled all the plugs that is unplugged and re-plugged them… check the connections – all shinny
> Vacuum lines all good and clear, except the pink one as I have no way to check that…
> AFM – I have one of the patch cords for the ‘highway hiccup” problem… ran with this on and off…. Didn’t solve the problem…
> FPR valve… new last year when I redid the fuel lines….
> Fuel filter was replaced this past summer and has about 1500 miles on it…
> Checked the fuel pump, not making any noise, and I am off to get a fuel pressure tester to see where we are there….
So if the fuel pressure test comes back good, what else should I be looking at?
Thanks |
|
| Ahwahnee |
Tue Dec 30, 2014 4:34 pm |
|
nacradriver wrote: ...what else should I be looking at?...
Examining the plugs might tell you if the problem is confined to one cylinder.
While they're out - good time to do a compression check.
While the ignition wires are removed you could check to be sure they are all good.
One problem that can arise after things warm up in there is a failing coil. Hard to test for a partial/intermittent coil failure, but I always have a spare known-good coil so it is quick to swap it on and see if things improve. No need to mount it permanently or to remove the current coil -- just strap/bungee it in place and move the wires over. |
|
| nacradriver |
Tue Dec 30, 2014 4:42 pm |
|
Ahwahnee wrote: nacradriver wrote: ...what else should I be looking at?...
Examining the plugs might tell you if the problem is confined to one cylinder.
While they're out - good time to do a compression check.
While the ignition wires are removed you could check to be sure they are all good.
One problem that can arise after things warm up in there is a failing coil. Hard to test for a partial/intermittent coil failure, but I always have a spare known-good coil so it is quick to swap it on and see if things improve. No need to mount it permanently or to remove the current coil -- just strap/bungee it in place and move the wires over.
Forgot to mention, all new plugs, wires, cap, and rotor... and the coil was new last year.... I am hoping these things don't fail that fast....
I'll pull the plugs over the weekend along with the injectors |
|
Powered by phpBB © 2001, 2005 phpBB Group
|