you set your TPS?
Ok so I'm having a fair amount of trouble with the timing of my 4age.
It's a bigport (out of a jap 86 apparantly) gone into my adm 86.
So, I've spent hours going through old articles on the forums about timing, but I'm still not getting it right.
I turn the engine to TDC (0 degrees on the timing marks above the crank pulley)
The crank mark lines up, the cam gear marks line up, and the mark on the cam shaft under the oil cap hole is there too.
I line the dizzy marks up and put it in. I bridge T and E1 on the ecu as I cant find the diagnostics plug in my loom.
I then get the timing to 10 degrees at idle (800rpm ish, when warm)
Sounds like I'm doing everything right? but for some reason when I rev the car it sounds very sluggish. As if there is a hesitation between when I turn the throttle and when the engine itself actually revs.
I cant really drive it atm as it's not rego'd, so I don't know how it actually goes. When I have the timing set to about 23 degrees-ish without T and E1 bridged the car seems to be a bit more responsive. To be honest I have no idea what's going on haha
Hoping someone has any ideas of what problem this could be?
Should I just have it set to 23 degrees? It's a stock engine, could this be bad for it?
Any help or opinions is greatly appreciated
Sorry about the essay, thanks for reading.
you set your TPS?
I have a simmilar issue, except my engine is a smallport, it wont run at all at 10btdc with the terminals bridged, it will run at about 37 btdc un bridged.
It runs alright at that but its always rich and got crap all torque.
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Throttle position sensor? How do you actually go about setting that?
I did have a feeling it might be that after reading through a few threads.
The engine was running in a different car before being removed to go into mine though, so I can't see why it wouldn't be set now?
Unless maybe the guy who had it in his car had the timing advanced which made it run ok, like mine does now.
cheers for the help!
It is possible that the outer ring of the harmonic balancer has spun in relation to the inner and therefore the crank.
I have seen it happen before when the rubber between the two perishes.
So the mark on the outer of the pulley is in the incorrect position, which as it drives the ancillaries gets spun backward slightly.
To absolutely confirm this you need to use a dial gauge down the 1 or 4 spark plug hole and find true TDC.
So it runs better when you advance the dizzy up ignoring the timing mark, good chance this is the reason.
Last edited by dangdang; 13th November 2011 at 02:18 PM.
I had a look at the car and i was thinking it could of been the same thing as dangdang is talking about.
We did pull a plug out and observe the piston, the mark on the crank is correct with the timing cover,
Feel free to correct me if im wrong ben, when the distributor is put in (with the marks on the dizzy) the timing mark was around 20deg, to get the timing around 10deg we had to take it out and turn it one tooth.
Does anyone know if there is any difference between any of the 16v cams (smallport, bigport, s/c)?
The cams are in the correct way, we compared them to my 4age daily.
Has anyone got any other ideas? we will start by checking the resistance of the tps sensor,
Cheers Jarrod
Ignore the mark on the pulley...you wont observe true TDC by eye the piston spends quite some time n degrees on centre.
I took it for a quick drive around the block today, only went through the first two gears but it felt pretty sluggish, especially 2nd gear.
It has no exhaust on it, so I'll take it to dingy tomorrow to get it put on for me.
But yeah I had it timed to about 20 degrees-ish, and it seemed to idle nicely and rev ok.
Just a bit shit when I actually drove it..