Failed Leakdown....what next?

Starting a new thread, not getting any response on the old one, here it is for reference.

https://www.tacomaworld.com/threads/bad-maf.764069/

Just to refresh though, its an '84 pickup with a '95 3rz swap. Got the full swap done and it will not run right, rough idle and stutters/falls on its face from idle to 3k rpm. Above 3k rpm it seems to run fine.

C.E.L. codes-P0300, P0302, P0303, P0304 (All misfire codes)
Compression test yeilded 132-139 psi on all cylinders
Valves are almost all within spec., the three that arent are only +/- .001 out of spec.

I've tried a ton of different things but nothing has worked. Just bought a leakdown tester and tested it and it seems to have failed.

#1 is -5%
#2 is -18%
#3 is -18%
#4 is -12.5%

During the leakdown, air is escaping from exhaust, intake, and crank case. Seems to be mostly from exhaust. Nothing in the radiator.

What should be my next step? TIA

 

There's no way you can have that much compression and those leakdown numbers.

 

Do you have enough fuel pressure? Did you update the fuel pump to the later model? Fuel pressure regulator isn't leaking fuel? Fuel evap emissions hooked up?

 

Edited: #2 is -18%

 

Don't know what fuel pressure is. Fuel pump is later model 22re. Replaced FPR with brand new OEM unit, didn't change anything. Motor is out of a '95 and just had the old style EVAP canister like the 22re.

Fuel related issues are really the only thing I have yet to chase down, other than the new FPR and new filter. The reason I haven't is because it runs what seems to be flawlessly abouve 3k rpm. I've yet to find anyone able to give a good reason why a fuel related issue would only effect the low end? How would it only run good at its highest fuel demand?

 

Have you set the timing with a timing light? Sent you a pm also.

 

Sounds like a timing issue to me as well.

 

More I think about it I'm leaning egr valve evap emissions.

 

Yes timing has been checked with a timing light.

Would it not throw a code other than misfire codes if it was egr or evap?

 

I did discover that the coolant temp sensor on the back of the engine is broken, so I need to order a new one. The plastic top of the sensor was cracked in half but it was still "together" and the ECM was reading the coolant temp when scanned as well as the coolant guage in the dash is/was working.

Edit: At this point I'm I have zero hope that this is the problem. However, I've seen people say a bad coolant temp sensor can cause some weird problems. So maybe, just maybe if it was reading, but had an intermittent connection causing problems??

 

Not always.

 

This motor has a distributor? Cap rotor been changed?. Have you checked pickup coil in distributor?

 

Bushing In distributor is tight? Shaft doesn't move back and forth?

 

Yes, yes, and yes. As well as new plugs (gapped properly) and wires. All checked good per FSM specs.

I'll have to check, though I'm sure I would have noticed.

Edit: No play in dizzy shaft.

 

Your lucky the thing runs at all with a broken coolant temp sensor.

 

Live Data I got during last scan.

*All data @ approx. 1100-1200 rpm idle.

Fuel Sys 1-CL
Fuel Sys 2---
Load PCT(%)-17.5 to 19.2
ECT-186*
SHRTFT1-1.6 to 0
LONGFT1-0.0
SPARKADV-12.0 to 12.5
IAT-62*
MAF(lbs)-.01 to .02
TP(%)-10.2
O2SLOC-B1S12--B2S----
O2B1S1(v)-.20 to .870
SHRTFTB1S1(%)- -2.3 to +2.3
O2B1S1(v)-.190 to .230
SHRTFTB1S2(%) N/A

 

Really? That seems kinda crazy to me.

 

I don't have EGR but sure sounds like bad EGR valve

 

Worst case it would just stick in open loop. Should run rich.

 

EGR is deleted.