timing advance-gctid808418

[Guest]

I timed my new 5.7 to 10 degrees.I accelerated to 2500 rpm and it only advanced 3 or 4 degrees,is this normal,if not how do I fix

[builderdude]

Normal for module 22

22a is the next one listed.





Attached files

[bkc914]

you need about 30 deg of adv at 3000, is it a mech dist or electronic???

[Guest]

wires go into module on exhaust riser

[Ruffryder]

"bkc914" post=808421 wrote:
you need about 30 deg of adv at 3000, is it a mech dist or electronic???

NOPE you do not.

All Mercruiser TB are electronic.

[builderdude]

"bkc914" post=808421 wrote:
you need about 30 deg of adv at 3000, is it a mech dist or electronic???

No, module 22 at 3000rpm will have a total advance of 24 degrees. Op is running a TB IV (4) ignition.

[Guest]

I get 15 degrees on timing tape at 2500 rpm,i disconnect ground from purple wire and restart.I now have 14 degrees at idle instead of 10

[builderdude]

No need to disconnect anything or jumper wire on the TB 4. Warm engine, set it at 8 degrees btdc at 650-700 rpm.

[Guest]

now my timing is 4 degrees BTDC at 2500 rpm,going nuts!

[bkc914]

look up service bulletin 95-11...it may be helpful

[Guest]

where do I find bulletin 95-11

[bkc914]

jsut google mercruiser servic bulletin 95-11, or give me your email and ill send it to you.....i tried attaching here but didnt work

[builderdude]

http://www.boatfix.com/merc/bullet/95/95_11.PDF

Pages11-12

5.0-5.7 engines using TB 4 with module 22

8 degrees btdc

[Guest]

BTW,just wondering when I set base timing by grounding purple wire,do I disconnect it after that and run through my advance time or keep it in?

[builderdude]

Spaceman there is no grounding required while setting base timing on a TB 4 ignition system. Grounding the purple/white is for TB 5 only.