23 – CPS timing advance mod

[fiatslug87]

CRUISER'S MOSTLY RENIX TIPS

RENIX CPS ADVANCE MOD

 

The sensor portion of the CPS needs to slide up the perforated bar towards the top of the engine.

Mark the perforated bar’s top end with paint or marker.

Place the CPS in a vice,  just not quite clamping the bar, the sensor resting on the vice jaws, with the Top part protruding.

Place a bolt that fits tightly into the hole at the Top part of the bar.

With a hammer, tap the Top part of the bar and it will slide through the sensor portion of the CPS. Stop when the sensor portion is about 3/8″ from the edge of the bolt hole.

 

Revised 1-31-2016

[89 MJ]

An alternative to this is buying a high altitude CPS. It advances the timing 5 degrees. 

[Ωhm]

This will also shift injector timing and when the ECU looks for KNOCK. At least on the 4.0L. Advancement's must be acceptable since they sell the part.

[garyweb3]

Where is the CPS located on the 2.5L? It's a 1987.

[Pete M]

3 minutes ago, garyweb3 said:

Where is the CPS located on the 2.5L? It's a 1987.

 

pretty sure it's in the same location as the 4.0: back of the engine, on the bellhousing, top and to the drivers side

[garyweb3]

Found it. Thanks. I also noticed that the engine has timing marks on the front cover. Is the timing adjustable and if so what should it be?

[eaglescout526]

19 minutes ago, garyweb3 said:

Found it. Thanks. I also noticed that the engine has timing marks on the front cover. Is the timing adjustable and if so what should it be?

No it’s not. Timing is controlled by the ECU and ICM. 
I honestly have no idea if this mod will positively improve the 2.5L or not. I have yet to do this mod. Not sure if I want to really.  

[garyweb3]

I thought it probably wasn't. Wonder why there is tab with timing marks and a line on the dampner?

[eaglescout526]

9 minutes ago, garyweb3 said:

I thought it probably wasn't. Wonder why there is tab with timing marks and a line on the dampner?

To set the timing if you do a rebuild or change out the distributor. 

[garyweb3]

Is there something in the TSM that describes what it should be? Just curious.

[eaglescout526]

26 minutes ago, garyweb3 said:

Is there something in the TSM that describes what it should be? Just curious.

6 o’clock on the distributor at TDC.