02 Burb - Replaced motor...won't start?

[PitchBlackC3]

What is the fuel pressure?
Did you reuse the original intake manifold & injectors or did these come with the new engine?
Check the grounds on the back of the heads, one on each side.

[mrharris32]

I will check the grounds again, I did put a jumper on the primary ground last night to ensure solid connectivity with no response. As I recall I had one ground strap on the passenger side (bolts to one of the tranny bolts), and then 1 heavy gauge/1 smaller gauge ground that bolted to the lower block on the driver side.

I have not yet checked the fuel pressure, it is strong at the incoming line purge valve. The intake and injectors on the motor now are the ones that came on the new engine, I did swap the coil packs (the ones on the new motor appeared to have been exposed to heavy moisture). Thank you for your response. I've yet to be defeated on a repair/swap...this will not be the first one!

[classic1]

It's probably the VATS or Vehicle Anti- Theft System. You or someone with the ability needs to unlock it. I did a swap into my 92 and had the same problem but once I unlocked it with HP tuners it fired right up.

[George C]

vats shouldnt do anything if its a replacement motor in the same vehicle


that isnt the crank sensor in back of intake its teh cam sensor and if you messed this up it wont run right. it would also throw a code asap if a wire is wrong somehting along the lines of high Freq

[Mr.Cornelius]

Hey guys im having the EXACT problem with the same issues can anyone PLEASE Help..

[truckinL33]

I don't know exactly what you did during the swap, but I would put the cam sensor from your buddies old engine into the new one and see what happens. The way you describe that cylinder 1 is soaked but the rest are dry, this may be because the cam sensor is damaged or something. It's free to do, and relatively easy. Furthure more, that exhaust bolt that broke off is common. It also happens to be on cylinder number 1 that it happens to. This is why I am assuming that cylinder number 1 is your fat cylinder, which is also why I am considering your cam sensor to possibly be faulty.

[oleshifty]

02 also had option of normal or flex fuel. It is possible the injectors on the NEW motor are a different size then his old motor. I would assume this would still start, but run pig rich, but it's hard to tell. I THINK the flex fuel injectors have a different plug, so it may not be possible to hook up wrong ones. Obviously make sure the coil packs are hooked up correctly on both sides. All injectors are plugged in, etc.

I would think a cam/crank sensor would throw a code immediately, but if you have spare parts laying around, won't hurt to throw them in and see if anything changes. They are just magnets. If motor sat a while, might be tarnished up and not reading correctly.