So I've had my this 89 13b N/A fc for maybe over a year now I always felt the timming was off so I had some time today to try and make some adjustments.

So I started like this I had warmed up my engine grounded the check connector then checked the the front leading plug with the yellow timming mark as I had suspected it was off by so much I couldn't adjust it in any way even after I had turned the CAS so I had decided to pull the CAS and start adjustments there when I pulled it even after lineing up the yellow marker with the pin my CAS was out of whack so I had lined up the red indent with the notch on the CAS and inserted back in engine.

After doing this I had restarted with my timming adjustments I had to slightly adjust my CAS so it would line up with the pin after maybe 10 sec the yellow timming mark would jump a large amount of degrees counter clockwise to the point were I won't be able to adjust using the CAS I had tried this process several time after with the same end results

Is this a common symptoms? what are some steps I need to correct??? Is this a internal problem or by removing front cover I'll find my answer please any advice or opinions are welcome

 

Has anyone experienced something similiar where you get the timming marks just right and then all of a sudden your timming retards itself and not giving you enough rotation to advance on your CAS I would need to pull the CAS and retry but same outcome would occur

 

Bump

 

Sounds like your car isn't dropping into idle mode which will keep the timing advanced even with the connector grounded. I found on my t2 prior to getting it to drop into idle mode every time I just had to set the engine to tdc and stab the cas and it was perfect every time. Assuming your pulleys were never swapped from the hub this should work.

 

I'm a lil confused sorry please elaborate

 

When coming to an idle if the tps is set properly and the rpms are below I think it's 1050 the ecu will enable all the idle settings which is an afr around 13.0ish and a change in timing.

It's pretty easy to know if it is happening properly if you have a wideband. Less noticable without. Its common to have a slight intermittent misfire at idle if it's not working even if your idle speed is proper.

I found on my s5 this made the normal timing procedure not work if there was a problem with this system as it would continue advancing timing even with the connector jumped because it wasn't in the idle mode it should have been in.

On my s5 setting the tps to the normal 1v and not by ohms when fully warm and off the thermowax cam got mine back to proper idle mode every time.

Unfortunently almost every rx7 tps setting has been altered by people not doing real diag and making driveability worse trying to fix problems that have nothing to do with the tps.