91 Pathfinder Timing Advance

JoeyS · Jun 10th, 2005, 08:24 AM

I think my timing may be either too advanced or to retarded. I am idling at 400 rpms, and it dies when it is cold. The idle adjustment screw does absolutely nothing for it, so I am sure it is the timing that is off.

On the VG30E 91 pathfinder, what is the best way to tell how the timing is set. The crank pully alignment marks ar all visible, but I can't find any marks on the distributor housing that the Haynes manual refers to. All I have been able to do is guess where it should be based on the wires.

Any help?

Animal · Jun 10th, 2005, 10:54 AM

Quote:

Originally Posted by JoeyS

I think my timing may be either too advanced or to retarded. I am idling at 400 rpms, and it dies when it is cold. The idle adjustment screw does absolutely nothing for it, so I am sure it is the timing that is off.

On the VG30E 91 pathfinder, what is the best way to tell how the timing is set. The crank pully alignment marks ar all visible, but I can't find any marks on the distributor housing that the Haynes manual refers to. All I have been able to do is guess where it should be based on the wires.

Any help?

When did this problem start? After you changed a part? Or all of a sudden?
I will strongly suggest that you get on-site help from someone who knows fuel injection / ECU systems. Your problem is more likely a vacuum leak, TPS, MAF, EGR, etc.. You will probably need to return the adjustments you made to their original positions.

JoeyS · Jun 10th, 2005, 11:25 AM

Quote:

Originally Posted by Animal

When did this problem start? After you changed a part? Or all of a sudden?
I will strongly suggest that you get on-site help from someone who knows fuel injection / ECU systems. Your problem is more likely a vacuum leak, TPS, MAF, EGR, etc.. You will probably need to return the adjustments you made to their original positions.

This came after changing the heads out and putting in performance cams.

I cannot find a vacuum leak, and the Haynes manual (although very good for breakdown/buildup) is very lacking in detail about the vacuum system. Is there a chart or diagram that shows all the vacuum connections for teh VG30E?

Animal · Jun 10th, 2005, 02:52 PM

Quote:

Originally Posted by JoeyS

This came after changing the heads out and putting in performance cams.

I cannot find a vacuum leak, and the Haynes manual (although very good for breakdown/buildup) is very lacking in detail about the vacuum system. Is there a chart or diagram that shows all the vacuum connections for teh VG30E?

Fotunately the EFI does not have as many vacuum hoses as carbureted engines. Unfortunately you are correct in you observation of the lack of details for the EFI system in the Haynes manual (pictures and diagrams in the emissions section is the best I have seen).
Did you remove and replace everything with #1 @TDC (compression)? Did your new cams have directions for timing changes? Are stock injectors OK with these cams?

JoeyS · Jun 10th, 2005, 03:10 PM

Quote:

Originally Posted by Animal

Fotunately the EFI does not have as many vacuum hoses as carbureted engines. Unfortunately you are correct in you observation of the lack of details for the EFI system in the Haynes manual (pictures and diagrams in the emissions section is the best I have seen).
Did you remove and replace everything with #1 @TDC (compression)? Did your new cams have directions for timing changes? Are stock injectors OK with these cams?

These are the NISMO cams, set 1, and using the stock injectors is okay. I kept all cam timing correct. The instructions did say to advance the ignition timing 5 deg, but that is all the detail it gives on that. I think I may have to spring for the FSM...