trevor1985

So, I finally got my truck running with a new Weber carb. It idles cleaner than ever, but if you give it gas too fast, even before the secondary barrel opens,
it bogs really bad. Then, when the secondary is opened at all, it backfires out the carb.
My carburetor did not come with a tuning guide or anything, so I'm pretty much stuck.
If anyone could help, that'd be great.

L5wolvesf

Before we can knowledgeably help we need some . . . knowledge from you. Starting with . . .
What is the condition (tune, compression, equipment, etc.) of the engine?
What jets does your carb have in it? Which choke? What is the fuel pressure set at?
Pictures are worth 1k words too.

trevor1985

The engine has around 120 psi of compression, for all of the cylinders. With the previous aisin carb, it ran okay, but it would have weird problems such as cutting out after a few minutes of running.
When I installed the weber, I removed the EGR and all vacuum lines except the vacuum advance.
I am not running a regulator, however, I am using a gravity fed tank for testing purposes. I have also tried using the electric fuel pump I am going to use with no different results.
I am not sure what jets, however looking down into the bowl, the two visible jets say 160 and 170.

Here are some pictures

L5wolvesf

I believe the 22R Toyota low compression spec is around 120 and really should be around 170 or so.
Did you do the compression test hot or cold ? Was it with throttle open or closed?

It looks like the stock fuel pump is still there is it working? I also see some disconnected hoses?

It looks like your #2 and 3 plug wires are sitting on a hot part.

trevor1985

I did the compression test cold with the throttle plates closed a while ago with the stock aisin.
The stock fuel pump is broken (I need to get a blockoff plate for it) which is why I have the electric pump.
That disconnected hose is one of the original hoses for the mechanical pump. I believe it was the return line to the fuel tank. I will be plugging it.
The fuel line to the carb is going to a gravity fed tank currently, however I will be installing a fuel pressure regulator today.
Thank you for your input. I will be performing a hot compression test, and moving the spark plug wires.

trevor1985

I performed a hot compression test and it was still 120 psi
What do you think the cause is of the low compression, possibly valve issues, or is the engine just conked out?

L5wolvesf

Was it with all the plugs out and open throttle?
Also, were all the cylinders the same?

The next step would be a leak down test to determine if it is valves, rings, etc.

trevor1985

Cylinders 1 and 2 are 120 psi cold with throttle open
Cylinders 3 and 4 are 160 psi cold with throttle open
I will likely be performing a leakdown test in the near future.

L5wolvesf

Uhmmm . . . more than a 10% difference across the cylinders is not good. Hopefully it is a upper end thing - leakdown should verify.. How many miles on the engine?

P.S. There are (or have been) several 22R engines on CL over the summer - a good builder motor is one way to go if you need one.