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post #1 of 5 Old 12-11-2019, 05:24 AM Thread Starter
40vern
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1999 XJ Cherokee 
 
Join Date: Dec 2010
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OPDA

what is opda? i have been reading allot of different things on this forum. since i started up my motor yesterday and let it run for the first time i have some questions.
the motor temperature gauge never did so it running hot but i did notice that the exhaust manifold started to turn a little red so i shut it down.
i have had this happen before on my old 22re yota motor.
i had advanced the timing on that motor and i new how to correct this easy.

so i have been searching this forum for timing. i keep reading opda and dont know what this is?

also i dont have anything hooked up to this motor yet.
the air box is still off.
the cannister is off.
and the vent tube that runs from the fuel tank beside the fuel line is still off.

i assume these things will make it run differently too.

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post #2 of 5 Old 12-11-2019, 05:52 AM
BlueFl.Wrangler
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This is just a SWAG-----oil pump drive assy ??
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post #3 of 5 Old 12-11-2019, 08:35 AM
jtec
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OPDA= oil pump drive assembly

you cannot set or adjust engine timing.
Do NOT move OPDA, dont touch it, don't look at it, nothing good will come of that.

You vehicle has a great diagnostic computer.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #4 of 5 Old 12-11-2019, 10:51 AM
Rubi4MyMrs
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Yes, oil pump drive assembly. It is where the distributor would be on earlier versions of the 4.0L engine & also has the cam sensor under the cap. If you have a distributor (pre 2000 TJ) you do not have one, the distributor also drives the oil pump.

On any TJ the ignition timing is controlled by the PCM & not adjustable.


It sounds like the engine is running lean, not a timing issue.


Hooking everything up might help. Also check for a vacuum leak, especially if it is idling high.
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post #5 of 5 Old 12-11-2019, 03:36 PM Thread Starter
40vern
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1999 XJ Cherokee 
 
Join Date: Dec 2010
Location: bham
Posts: 441
thanks

Quote:
Originally Posted by Rubi4MyMrs View Post
Yes, oil pump drive assembly. It is where the distributor would be on earlier versions of the 4.0L engine & also has the cam sensor under the cap. If you have a distributor (pre 2000 TJ) you do not have one, the distributor also drives the oil pump.

On any TJ the ignition timing is controlled by the PCM & not adjustable.


It sounds like the engine is running lean, not a timing issue.


Hooking everything up might help. Also check for a vacuum leak, especially if it is idling high.
been hooking everything up. the cruise control thing has the charcoal thing i think and the washer fluid canister. several vac lines. going to hook the breather box now
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