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Hot!4AGE start problem after build

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GTIRHil
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2019/11/05 21:02:27 (permalink)
0

4AGE start problem after build

Hi
I finally have my 4AGE back in my '89 AW11.  But it doesn't want to start.
 
I checked ignition timing and it is about correct on cranking.  10 BTDC.  And there is a good spark.
 
There's a bit of a smell of fuel but that is always hard to judge.  Plugs are a little wet.
 
The head is reconditioned but pistons are original high mileage.  Compression is 120 on 1 and 130 on 2.  Pretty low.  But the engine has stood for a while.  The head was skimmed 0.8 mm and I put adjustable cams in and advanced them a bit to make up for it.  To my surprise the engine is now interference but I was careful not to crash the valves.
 
So - do people think that the low compression might be that I got the cam timing wrong?  And that might be why it won't start?  But a big drop in compression would mean that the cams were more than one tooth on the cam pulleys wrong, wouldn't it?
 
Thanks!

Hil's car all the way!
North Canberra
#1


3 Replies Related Threads

    kojab
    MR2 Deity
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    Re: 4AGE start problem after build 2019/11/05 21:22:52 (permalink)
    0
    Its unlikely to start if the plugs are wet. Throw a new set of gaped plugs in.  You might be pleasantly surprised.
    Wet plugs will usually short out the spark.

    92' SW20 3SGTE   GEN2 GT Hardtop
    87' AW11 3SGTE   Now Delco EFI ecu & 21 psi boost
    71' KE25 3TGTE    Delco EFI ecu. Unopened std engine 24 psi boost
    78' KE55 L67        Delco EFI ecu
    #2
    GTIRHil
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    Re: 4AGE start problem after build 2019/11/05 22:01:51 (permalink)
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    I'll do that.
     
    It's very easy to create new problems as one progresses!

    Hil's car all the way!
    North Canberra
    #3

    GTIRHil
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    Re: 4AGE start problem after build 2019/11/06 19:52:27 (permalink)
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    OK  - dried the plugs.  Only one was really wet.  Some of the plugs are definitely burning something (they are black) but the engine still doesn't want to fire.   Ignition timing is showing 10 degrees BTDC.
     
    So, I never was sure about the cam timing, as posted before.  The zero marks on the Blox gears put them a bit off from the original gears.  I wanted to stick with the OEM but I was worried about the 0.8 mm head skim.
     
    I tried moving them from what I think was advanced to retarded.  The engine didn't run.  BUT I tested the compression and got 90 PSI on cylinder 1.  So I put them back the other way but a bit more than I had them before and got 130 PSI. 
     
    So, lined up left 120 PSI, right 90 PSI, back further left 130 PSI.
     
    It looks as though I need to keep going left.
     
    I do assume that both cams should be set the same, as with OEM pulleys.  The length of belt between them has not changed.
     
    Please, any thoughts welcome.

    Hil's car all the way!
    North Canberra
    #4
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