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Honestly I don’t think those findings really tell you anything and as for access well welcome to the wonderful world of the Astro Van.
Newest UPDATE. So, I used the pin hole in the water bottle trick and did find a vacuum leak on the passenger side of the intake manifold. I had done a vacuum test through the dipstick tube looking for vacuum ( lower intake leak ) and only had slight pressure ( piston blow by ). I had decided on the pinhole leak when I had earlier taken the garden hose to the van and it about killed it. Taking the water bottle to it caused the CEL to flash a severe misfire.
So, I buckled down, and did it. I replace the lower intake gasket and the plenum gasket. Cleaned up the intake let it sit overnight while the RTV cured, replaced the timing cover since it was leaking horribly and I already had to drain coolant. That wasn’t a terrible job really….
So, I fired it up and got a backfire. I though I had accidentally swapped two poppet valves, but in reality had swapped two plug wires. Figured that out by doing a cylinder drop test.
Now here’s the rub. I’m getting high 20s to 30 short term fuel trim at idle, zero long term. They clean up when I give it some gas down to single digits or zeroes, but then increase the longer it stays at the new RPM. I have to recheck my fuel pressure ( new fuel pump and filter 2 years ago ) and I didn’t have the resources to put in a new spider, and there was no evidence of any leaky poppets or fuel pressure regulator.
I still need to set the CMP retard and check for misfires before I do anything else. I have access to the pressure pot style fuel injector cleaner…I think I am going to run some injector cleaner through that as well since I have it available. I am going to reset the computer to relearn the adaptive trim as well so I can get a new baseline.
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