Explosion, now no start.

vikenabm · 08-14-2012, 11:10 PM

A bit stumped, frustrated, would love help making a diagnostic task list to get my car started again. MKIII turbo swap into 1989 NA body, ran okay but was tracking down high pressure boost leaks with custom piping to the new intercooler. IN the process i carelessly set the timing wrong, or I think I did. It started with difficulty, ran horribly with a lot of fuel smell, wouldn't rev, and when i opened the throttle it exploded, loudly, and stopped abruptly. Restarted the same way, then did the same thing. Hasn't started since then. found CPS timing badly off but intake cam was still up when crank was at TDC. Turns over, but no sense of any ignition happening. pulling injector resistor connector doesn't affect the turn over sound at all.

Fuel: Fuel pressure is good, tried anywhere from 30psi to 45 with no luck.

Spark: Iridium plugs damp but not damaged, except number 6 plug was dry, also undamaged. cleaned them, checked resistances of plugs, wires, injectors, injector resistors. observed good sequential sparking in all 6 plugs mounted in a threaded metal holder. Engine grounds are all retapped and clean.

Compression: about 155psi in all cylinders.

Turbo impeller turns freely without play.

New RC injectors were working, but i put a new heat shrink on all of them. Don't know that I have any reference on what polarity they need, so if that matters please let me know. worried about injectors stuck open.

Questions:
is that explosion "detonation"? SOunded like the sound of a block on the bench being static pressure tested and having the valve popped open with a mallet to seat it. that type of loud pop but much louder resonating through the exhaust system.
What else should I test?

Thanks!

Mods:

K&N filter to Lexus AFM | 660cc RC | Holley 255 LPM FP | JE/Eagle internals | 2.5" hard pipes | Toyo high flow intercooler| S Sanchez ported head | 1.2mm beaded MHG | compression 9:1 w/0.5 overbore | modified ex mani | CXR 3" full exhaust | Slotted/drilled rotors |New WG spring @12psi w/ dual switching man boost | Colt Mild perf. Cams | Bosch BOV | XTD clutch | Tokico Illumina w/TEMS | ES bushings | 18" Pirelli P-zeros | Manual AFPR

08-14-2012, 11:10 PM	#1
vikenabm Stock Join Date: Dec 2006 Location: Howell, MI, USA Posts: 21	Explosion, now no start. A bit stumped, frustrated, would love help making a diagnostic task list to get my car started again. MKIII turbo swap into 1989 NA body, ran okay but was tracking down high pressure boost leaks with custom piping to the new intercooler. IN the process i carelessly set the timing wrong, or I think I did. It started with difficulty, ran horribly with a lot of fuel smell, wouldn't rev, and when i opened the throttle it exploded, loudly, and stopped abruptly. Restarted the same way, then did the same thing. Hasn't started since then. found CPS timing badly off but intake cam was still up when crank was at TDC. Turns over, but no sense of any ignition happening. pulling injector resistor connector doesn't affect the turn over sound at all. Fuel: Fuel pressure is good, tried anywhere from 30psi to 45 with no luck. Spark: Iridium plugs damp but not damaged, except number 6 plug was dry, also undamaged. cleaned them, checked resistances of plugs, wires, injectors, injector resistors. observed good sequential sparking in all 6 plugs mounted in a threaded metal holder. Engine grounds are all retapped and clean. Compression: about 155psi in all cylinders. Turbo impeller turns freely without play. New RC injectors were working, but i put a new heat shrink on all of them. Don't know that I have any reference on what polarity they need, so if that matters please let me know. worried about injectors stuck open. Questions: is that explosion "detonation"? SOunded like the sound of a block on the bench being static pressure tested and having the valve popped open with a mallet to seat it. that type of loud pop but much louder resonating through the exhaust system. What else should I test? Thanks! Mods: K&N filter to Lexus AFM \| 660cc RC \| Holley 255 LPM FP \| JE/Eagle internals \| 2.5" hard pipes \| Toyo high flow intercooler\| S Sanchez ported head \| 1.2mm beaded MHG \| compression 9:1 w/0.5 overbore \| modified ex mani \| CXR 3" full exhaust \| Slotted/drilled rotors \|New WG spring @12psi w/ dual switching man boost \| Colt Mild perf. Cams \| Bosch BOV \| XTD clutch \| Tokico Illumina w/TEMS \| ES bushings \| 18" Pirelli P-zeros \| Manual AFPR