90 Ls 400 Code 13

[Milehigh3]

Both cam sensors are new and so is the timing belt.Runs good but afraid to drive it. Clear codes and lite comes back on every time. Any ideas ?? Driving me nuts !!,lol. Sure could use some help...Thanks...Butch

[billydpowell]

Here are some pages form the repair manual for "check engine" light problems:

Here's some extra info: MOMENTARY INTERRUPTION

During diagnosis, if Codes 13, 22, 24, 41 or 47 are stored in

ECU memory and no trouble can be found with these circuits, it will be

necessary to perform a momentary interruption test.

1) Clear codes from ECU memory. See CLEARING CODES in this

article. With ignition off, connect a jumper wire between terminals E1

and TE1 of TDCL connector.

2) Start engine. Ensure CHECK engine light goes out. Pull

lightly on wires and apply vibration to connectors and relays

associated with diagnostic codes.

3) During this test if CHECK engine light illuminates, it

indicates which connector or where in the wire harness there is a

fault. Repair as necessary.

4) Clear diagnostic codes. Start engine. If CHECK engine

light does not go out, check thoroughly for faulty connections.

Perform MOMENTARY INTERRUPTION LS400 test again. If CHECK engine light

still will not go out, see LS400 CONTROL UNIT in I - SYSTEM/COMP TESTS

article. more later

Looks like the problem was caused by the timing belt jumping a tooth on one cam. Replaced the timing belt (& water pump while I was in there) and the engine runs great again