Ignition timing n/a

MID LIFE CRISIS · Post by **MID LIFE CRISIS** » Sat Oct 03, 2009 6:57 pm

There is a thread in "Knowledge Base" about this for a tubby, is it the same for a n/a ? The question is asked after the thread but no replies. Also, clockwise or anti-clockwise to advance/retard ?

Cheers Jayson

going4the1 · Post by **going4the1** » Sat Oct 03, 2009 7:37 pm

Yes it is exactly the same procedure.

Don't recall which way you twist to advance/retard - but it will become obvious when you do the timing.

One consideration not covered is that you need to be careful about lining up what appears to be 10 deg BTDC as viewed from above. Viewing the same from wheel level (with the wheel and undershield removed) looks slightly off.

MID LIFE CRISIS · Post by **MID LIFE CRISIS** » Sat Oct 03, 2009 7:45 pm

going4the1 wrote:Yes it is exactly the same procedure.

Don't recall which way you twist to advance/retard - but it will become obvious when you do the timing.

One consideration not covered is that you need to be careful about lining up what appears to be 10 deg BTDC as viewed from above. Viewing the same from wheel level (with the wheel and undershield removed) looks slightly off.

Cheers mate, i have a problem with a "pinking/ det." sound @ 5500 rpm (thread on here lower down) so going to check timing and maybe retard a touch to stop noise. Any thoughts on this mate ?

going4the1 · Post by **going4the1** » Sat Oct 03, 2009 8:17 pm

The ignition timing on the MR2 is a hybrid - It is set by the method shown. However thereafter (after the engine is warmed up) the spark is retarded by the ECU dependent upon engine speed.

Artificially retarding the spark will affect the performance throughout the rev range. Can't recommend it.
Pinking at higher revs in this situation is normally attributed to excessive carbon build-up in the cylinder head.

I've just read your other thread and it's full of good suggestions. Have you examined your spark plugs?

MID LIFE CRISIS · Post by **MID LIFE CRISIS** » Sat Oct 03, 2009 8:41 pm

Not since Rogue did earlier this year mate. What am i looking for ?
In relation to carbon build up in the bores, how about removing the plugs , and a cap of Redex into the the plug holes/bores, a flick of the ign. key to spread it around, replace plugs and leave for 15 mins for Redex to soak in. Then fire up and drive, leaving a smoke screen behind for miles. This is an old way admitted, seemed to work on older cars a few decades back.

Was it really that long ago, where did the time go ?

going4the1 · Post by **going4the1** » Sat Oct 03, 2009 9:14 pm

There are a few thing on the net about putting various stuff into the cylinder via the spark plug hole.
Can't see using some redex will do any harm. How you'd get it onto the cylinder head is another matter.
Wasn't there an old trick about pouring it into the carb intake whilst the engine was running to burn off deposits. I tried that once - didn't work!!

That was many many years ago as well. I see we joined together (date registered!!)

Regarding the plugs - If there has been excessive Pinking - they may appear unusual. You will remember those photos in the back of the Haynes Manuals.
If they appear 'normal' you may be incorrectly diagnosing your problem?

MID LIFE CRISIS · Post by **MID LIFE CRISIS** » Sat Oct 03, 2009 9:28 pm

Yeah, ha ha, pour the Redex in the carb on a fast idle, i remember that one. Plugs looked ok when Rogue checked her over for me, i'll whip them out again and check them. I have tried to describe the problem as best i can. The "pinking noise" is only at high revs and not every time, but more often than not and is pi$$ing me off !

MID LIFE CRISIS · Post by **MID LIFE CRISIS** » Sun Oct 04, 2009 2:24 pm

Plugs are Denso PK20R8, they look a little white/lean to me, not a golden brown. So how do we richen her up a touch, (turn a screw somewhere ?)

Cheers Jayson

going4the1 · Post by **going4the1** » Sun Oct 04, 2009 4:01 pm

Just compared them to a set a took out of my car a few months ago. The electrode and ceramic core on my old Bosch plugs have a definite brown hue.
I had a bad experience with Denso (formerly Nippon Denso) plugs some years ago and always now use NGK platinum. (BKR6EP - 8 ) but that's another story.

There is another image on the web to compare:

http://images.google.co.uk/imgres?imgur ... N%26um%3D1

There isn't any mixture screw. It's all governed by the ECU. Assuming the timing is correct and assuming that you have correctly diagnosed the 'pinking' this could be caused by some kind of fuel restriction (at higher revs). The appearance of the plugs suggests a possible lean mixture (but I'm no expert) Possibly the fuel filter?
Have you changed the fuel filter recently? There service intervals vary with Toyota. My general rule of thumb is every third service or 27K miles.

MID LIFE CRISIS · Post by **MID LIFE CRISIS** » Sun Oct 04, 2009 4:18 pm

Cheers mate, as you will have read the fuel filter has been mentioned before by others, and i have no idea when it was last changedso i'll get one and change it. Will keep you informed, thanks again. ( was joking about a mixture screw )

going4the1 · Post by **going4the1** » Sun Oct 04, 2009 4:25 pm

Of course you might find that the choke isn't opening fully as well. Things used to be so much simpler then!!

MID LIFE CRISIS · Post by **MID LIFE CRISIS** » Sun Oct 04, 2009 4:34 pm

going4the1 wrote:Of course you might find that the choke isn't opening fully as well. Things used to be so much simpler then!!

LOL ! The good old days

Take a look at BBC 4 at 9.00, i watched it in the week , Excellent !

MID LIFE CRISIS · Post by **MID LIFE CRISIS** » Sat Oct 10, 2009 5:53 pm

Ok, fuel filter changed and still have the problem. Only too glad it only cost me £20 for the filter and not the £28.50 for the filter plus £25 (1/2 hour labour at Rogue) not to fix it. When she's cold, with cold start/choke on she's fine . Very occassoinly when warm the tick over will raise to 1100 rpm, as if cold start/choke slightly on and no pinking/det. at high revs then. Whats next ? What part controls mixture that i can change/ try next ? Giving me a headache now, and i stink of petrol

whippet · Post by **whippet** » Wed Nov 11, 2009 10:23 pm

Have you checked for air leaks?, does it have a knock sensor?

MID LIFE CRISIS · Post by **MID LIFE CRISIS** » Fri Nov 13, 2009 8:44 pm

whippet wrote:Have you checked for air leaks?, does it have a knock sensor?

Can't see any leaks and not sure if it has a knock sensor mate

bobhatton · Post by **bobhatton** » Sun Nov 15, 2009 11:15 am

Have you checked the timing yet?
The plugs look ok but did you do a plug chop, ie run at the speed you get the pinking then turn the engine off and cost to a stop and check the plugs?

Bob

MID LIFE CRISIS · Post by **MID LIFE CRISIS** » Tue Nov 17, 2009 7:01 pm

bobhatton wrote:Have you checked the timing yet?
The plugs look ok but did you do a plug chop, ie run at the speed you get the pinking then turn the engine off and cost to a stop and check the plugs?

Bob

Not even thought of this mate . Will do and post pics of plugs. Cheers Jayson.

www.imoc.co.uk

Ignition timing n/a

Ignition timing n/a

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