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Resolved 402A Engine idling @3000 RPMs, just dropped a new rebuilt motor in.

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Harleyoi

Probationary Member
24
8
Jul 22, 2023
Phoenix, Arizona
Thank you for reading this. My son and I just dropped our 98 420A motor in. Went very smooth, upon start up one of the o-rings on my #2 injector failed and was spitting gas everywhere. I fixed, started it back up again and it jumped all the way up to 6000-6500 rpms. I got it down to 3000 RPMs when I start it however the throttle is touchy. I barley tough it, and it jumps tos 4500 RPMs and holds there.

Any help would be awesome, thanks again.

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Update! Thank you very much for the help.

I replaced all the vacuum lines, and as it turns out a PCV valve was quite important. I had the intake manifold connected directly to the valve cover (haha dummy me). The end result the car sounds amazing, and does not over heat. Have not ran it yet. That's my next scare, the transmission. I bought a used transmission with 70000 per the junkyard, but I'm not seeing why it shouldn't go.

Thanks again. Hope you have a Merry Christmas!
 
Without a PCV valve it would be sucking air straight through the breather and causing a massive vacuum leak. You definitely needed that in place. Also, 70k miles is very low for these transmissions and should be healthy. Unless something had gone seriously wrong, a 70k mile NV-T350 should shift like a dream and be very quiet.
 
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Without a PCV valve it would be sucking air straight through the breather and causing a massive vacuum leak. You definitely needed that in place. Also, 70k miles is very low for these transmissions and should be healthy. Unless something had gone seriously wrong, a 70k mile NV-T350 should shift like a dream and be very quiet.
Thats awesome to know, right on!
 
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