‘94 80 runs fine but lately bogging down (1 Viewer)

[Tools R Us]

Where is this check valve located?

The fuel pressure regulator holds pressure on one end, the check valve in the fuel pump on the other, and injectors can leak (rare).

The 80 had been parked less than 30 minutes. After he bolted the fuel line back on it fired right up (less than 3 seconds) same as it always does.

So not a problem. I have never seen a leak down issue on a 1FZ. When the starter is activated, the fuel pump is also, brings it up to pressure quickly. If an injector were leaking, it will normally flood that cylinder, causing excessive rich/black smoke, start up.

 

[auttiman]

The most common cause of loaded miss, power problems, is the main engine harness rubbing on the EGR pipe. It's an easy check, there was a clip to hold it in place that fails with age, if this is the case, use a couple of zip-ties to secure the harness and see if that solves the problem.

View attachment 1885017

Can’t tell looking in my bay.

 

[Tools R Us]

Can’t tell looking in my bay.

The problem site is between/under the EGR and firewall.

 

[BILT4ME]

Can’t tell looking in my bay.

Underneath those two circular things next to the firewall....