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Rb26 With Twin Afm's, If I Get Them Mixed Up Will The Car Not Start?

nsta

By nsta,
in Engines & Forced Induction

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nsta Mentor

nsta

Posted
Posted (edited)

Hey guys, im trying to figure out why my car aint starting, i suspect my cas is the fault(as we dropped it), but i was thinking, if the AFM's were switched when plugged in, would this cause the same problem???, im sure ive plugged them in correctly, but just want to make sure,for me to test this though, id have to remove the arc air box etc, bt of work invloved, as one of the plugs can only reache to the afm, which is the reason why i think i have them setup correcty....is there an easy way to test this???as my car aint starting at all right now!, will my car start without the afms plugged in?

thanks

Edited by nsta
Adriano Grand Master

Adriano

Posted
Posted

None of the above will stop the car starting. Check for trouble codes in the ecu. Have you puled the cas out and turned it by hand to see if the injetors are clicking yet? A troubled CAS will pull a trouble code in the ecu.

nsta Mentor

nsta

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Hey, yes when i turn the cas unit, i hear the injectors clicking.....does this mean that its working fine?, i just refitted my new head, and since its not working.....Timing is spot on, when i turn the keys, car almost starts, then a vacuum sound comes through the intake, and then nothing....i dnt know what it is...

If i can hear clicking in the injectors with the cas unit, does this usually mean that the cas unit is fine?

nsta Mentor

nsta

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Replaced cas, car started immediately, but was running very rough....is it usual for my engine to have noisy lifters for awhile after replacing headgasket and doing a bit of headwork?....im scared as someone said thats usual, while another said that could be your valves bent:(.....knocking in other words...i dont know how to tell the difference, someone is coming to have a look at it tommorow....

nsta Mentor

nsta

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Well the timing and everything is spot on, i removed everything and rechecked, but my car seems to be still rattling, i thought it was the lifters, as they were noisy before i even replaced the gasket(when the motor was fine)....but this sound is amplified by 10!, i mean the more revs, the more noise they make, which makes me think they are knocks, im getting a mechanic to check today...

nsta Mentor

nsta

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Thats something the head reconditioner's would have done (hope they did)......could this be the noise?, if so, im going to be annoyed if i have to remove head again because of something they didnt do......

i did recheck the timing, and it was off by maybe a tooth, so im going to get the guy whos coming around to redo the timing and see if that helps, will having the timing off by a tooth cause bent valves and danger zone?....i heard someone who was out by 2 teeth and was running shit performance, but fine otherwse.....

Im crossing my fingers its not Big ends (knocking).....could knocking occur due to wrong timing?

MrStabby Grand Master

MrStabby

Posted
Posted

If BB says it can get noisy then yes that could be the noise :(

What head work did you get done? Was there cam work? Maybe the head guy thought your tuner would do the clearances.

You can set the clearances with the head on - just need to take the cam covers off (no shit huh?)

Beer Baron Grand Master

Beer Baron

Posted
Posted

incorrect valve clearances will definitely give you a noisy valve train and often it's difficult to pick bottom of engine noises from head noises. it's possible they didn't think it worth checking (unlikely), or maybe couldn't get a hold of the shims needed (less common these days, than it used to be), but I wouldn't point the finger just yet. this is just a diagnosis phase. I don't think having the timing out by 1 tooth would cause any engine damage, but at the same time I wouldn't promise that it wont either. get that fixed and try again. some one with a good ear for RB26 should be able to tell you what the noise is. It can be tough as there are lots of noises going on. injectors are noisy, clutch fan is noisy, and the valve train is a little noisy too (though usually not as loud as the injectors).

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