HELP! Power loss after timing belt & water pump

[tru350z]

Hello everyone!

I just bought a 98 QX4 with 150k miles and had Check Engine Light(P0100 and P0325) on when i bought it.
I relocated a knock sensor and the code didn't come back for week.
Right after my mechanic replace timing belt, water pump, seals, thermostat and etc, CEL came on for P0300. Q kept stalling on every stop light so replaced MAF fixed stalling issue. Still had Check engine light for P0300.
Next day, i started up no engine check light but noticeable loss of power.

Any advice what i should look for please?

[ARKQX33V6]

You may be in limp home mode also because of timing belt change do a static timing check and dynamic verification and see if advance is working.

[ARKQX33V6]

Verify your distributor with P0300 miss fires, check HT cables, connections, plugs

[tru350z]

Thank you very much for fast response!!!

Verify your distributor with P0300 miss fires, check HT cables, connections, plugs

Checked distributor, cables, connections and plugs.

You may be in limp home mode also because of timing belt change do a static timing check and dynamic verification and see if advance is working.

How would i verify advance is working?

CEL should pop up if timing is messed up right?

[Chuck Tribolet]

The timing belt may be a tooth off on one or both cams.


Chuck

[tru350z]

Thank you very much for all of your help.
Timing was off and it does have good power.
Still shows cel for p0300.
Any idea plz?

[asnorton44]

P0300 is random cylinder misfire. I would start with plugs and wires.

I had P0300 and replaced coils/plugs and been running strong since.

[Chuck Tribolet]

Have you cleared the P0300 code? If IIRC, it take five clean drive cycles before it will clear itself.

I THINK "drive cycle" start out cold, drive it till warm (there may be minimum time or distance), stop and let cool. Most of us get two drive cycles in a day, IF the weather isn't real hot (on hot day, I'll still show just a touch of temperature on the gauge when I come out of work.


Chuck

[VG33QX4]

a jumped tooth could possibly throw a misfire code since the camshaft position sensor is in the distributor

[ferrariowner123]

Im re bumping this thread, because i am having the EXACT same issue, but i know timing is not an issue.

Im having new plug sent, hopefully that fixes the problem.

http://npora.ipbhost.com/index.php?showtopic=32967

Check out the thread for more info.

Thanks

-Kyle