camshaft retard offset

[SunlitComet]

If you are close to Houston, I will take a look at it for you!

---------- Post added at 03:08 PM ---------- Previous post was at 03:07 PM ----------

BTW, I advanced my timing 5 degrees to get a bit more power and throttle response. Truck runs awesome now!!! The light wont come on unless there is more than 10-12 degrees retarded or advanced IIRC.

Wait! Going to +5 gives you more power? Really? Please explain?

I would like to know this too. This doesn't seem right.

 

[ryank99]

are you reffering to setting the offset +5* ?? from what i understand it throws the SES code if off more that + - 4*.
but i do see how it could run better just becuase when i had trouble getting my offset adjusted the first time, it was set at 12* retard and it felt like i was pulling a semi, so like the older non computerized ignitions, slightly advanced timing equalled more power.
i guess im comfused with the advanced timing aspect just becuase its the crankshaft/camshaft offset that is being changed and not necessarily the timing.

 

[99Yuk]

I think he is referring to the retard offset that's adjusted by turning your distributor.

So who wants to volunteer to try this?
When it warms up, I will. Just to see if it works and gives me more kick in the butt-o-meter results. It'll be a few weeks yet though...

 

[SunlitComet]

Setting is 0 degrees + or - 2 degrees anything more and the monkey flips the light switch.

 

[ryank99]

i wouldnt mind being the test subject, but i dont have easy access to do the offset adjustment. let us know if it works out, cause if its a noticable improvement, im all for it

 

[amack23]

I have a 96 Tahoe 5.7 V8 with 202,000 miles. I was getting the dreaded P0300 (Random multiple misfire) code so I decided to do a minor tune-up before taking it to get emissions tested. I changed the plugs, cap, rotor, pcv valve and dielectric grease on the usual parts. The wires are not that old and they still looked pretty good so I decided to leave them in. Also, before changing the plugs, I decided to Seafoam her. After this minor tune-up, the P0300 code went away (yes!) and a new one appeared. Now, I have the dreaded p1345 (cam timing issue). I’ve had this Tahoe for 12 years and I never seen a p1345 code before. Is it possible to install the rotor incorrectly? Could I have thrown the retard off? The distributor does not move at all when I tried turning it to see if it’s loose and I even put the old rotor back in to see if the new one was bad. I’m not sure if that was a good test but I did it anyway. Does the rotor button prong have to point in a certain direction or does it matter? It just seems odd to me that changing out these parts can throw this particular code. Any help you guys render is MUCH appreciated!

 

[SunlitComet]

The cam sensor reads a trigger from the distributor shaft so a rotor change would not do it. If your scanner reads the same rpms as your tach on the dash then assume you setting get disturbed some how and re-zero your cam retard you should be fine. If the scanner sees a much different reading then the dash then you cranks sensor circuit is screwed up.

 

[ryank99]

i would suggest removing the distributor and looking at the distributor gear to see if its worn. if it is, it will cause excessi e play and throw that code so you will need to replace the distri itor

 

[SunlitComet]

At which point you would have to definitely re-zero the adjustment with a scanner.