timing waaaay out??

[l1ttle_d3vil]

hey there, got a bigport 4age running on ae86 gear, all sweet apart from the timing. i've changed it back and forth a few teeth but can't seem to get it right - it seemed to run nicely advanced to around 20º but run like crap at 0º. actually had it running semi-decent at around 40º

I initially thought the loom may not have been compatible with the dizzy and the ecu was telling it to advance when it wasn't supposed to be but i've checked all the wiring and it matches up all sweet.

any ideas why it won't run properly where its supposed to? i'm a bit stuck for ideas, so can only keep playing around and adjusting things until it comes right.

cheers

[d1 mule]

the keyway may have broken etc causing the pully to go out?

[Mr Revhead]

are you setting the timing while bridging the correct diagnostic terminals?

[ezy10s]

also double check the tensioner pulley is tight.

[l1ttle_d3vil]

definitely bridging the diagnostic terminals correct.
pretty sure the keyway + tensioner is fine, but I will double check them - i haven't had a good look yet

cheers

[Lloyd]

What are you trying to set the base timing at exactly?

[KinLoud]

Make sure the throttle is fully closed - if the throttle position sensor (tps) thinks it is open then the timing won't go to the base timing of 10 degrees...
Been there, done that... learnt my lesson.

Ken
Ham
021 408 863

[Trls250s]

If you cant short that terminal correctly (or as a double check) the factory timing is 16 degrees.

On the cam sprokets there are little dots on the teeth themselves as well as on the wheel, these dots on the teeth line up exactly with the lines on the backing plate.

Also double check your crank pully, they can chip easy and what you think is a timing mark could infact be damage.

[gmacrae]

what ^he^ said, sounds like cam timing's out

[matt dunn]

Try this

[l1ttle_d3vil]

keyway seems fine.
tensioner is fine.
TPS was working fine when I took the engine out, will check the wires are connecting properly on the new loom though
cam sprockets are lining up properly with the indents etc
everything exactly as described in the pic above

now the only thing I've worked out is the timing on #2 and #3 is spot on - it will run really nicely at 0º, but if I put the timing of #1 or #4 cylinders at 0º it runs like crap.

the timing is always set from #1 cylinder isn't it?? i've got the leads around the right way, checked it many times!! in the end i've just set the timing going off #2 and it runs nicely, idles smooth, revs smooth, starts first pop etc. surely it wouldn't run like this if something was 180º out would it? otherwise what else could cause this to be back to front?

[Zak]

It will do that with coil packs if your wiring isn't quite right. Either set it to number 2 or re-check your wiring.

[l1ttle_d3vil]

that makes sense then - one of the ecu plugs had been smashed so I got a new plug and rewired it all going off a couple of different wiring diagrams.

99% of it is right, dizzy wiring is definitely right. coil wiring is sweet - only two wires to get wrong on that. unless I mixed something up with the TPS wires but that shouldn't swap the timing around like this - more likely just stuff everything up

oh well, it runs all good like this

[ChaosAD]

checked tps calibration?

[l1ttle_d3vil]

no not yet, but i used the throttle body off the engine which came out so nothing was altered (previous engine ran fine). also if the TPS was faulty surely it wouldn't idle and rev smoothly?

[Zak]

By the sounds of things you have the wrong wires going to each coil, just need to swap them round, or just leave it, it really makes no difference as long as you know about it.

[l1ttle_d3vil]

its only running a single coil setup (old bluetop/ae86 style). someone suggested the dizzy rotor is 180º around, which could be right - will check it out.

took the engine out for a drive tonight though and it goes reaaal nicely, gona go good with a turbo on the side

[matt dunn]

its only running a single coil setup (old bluetop/ae86 style). someone suggested the dizzy rotor is 180º around, which could be right - will check it out.

took the engine out for a drive tonight though and it goes reaaal nicely, gona go good with a turbo on the side

180 out on the rotor wont make the timing light show up wrong on number 1.

Pull the no1 spark plug, put a 3/4 dr long extension down the hole and
turn the car over with a spanner on the fron crank pulley,
( make sure the ign is off, best to pull the keys out and put them on the seat)
and make sure that the TDC mark on the front pulley is exactly when
the extension stick out the top of the engine the most, to tell the
the piston is at the top of the bore when the marks say TDC.

Matt