SR problems

[grey_240sx_man]

I get my car started last week and it was jumping around like it had a boost of vacuum leak. Now after popping off the valve cover 3 times to make sure the timing was right, and checking all my intercooler pipes and my vacuum lines it is still doing it. It jumps to 15 on my vacuum gauge during start up, but when it tries to idle down the vacuum goes to hopping between 5-10. And it will die. I've been trying to trouble shoot for the past week. I got all the grounds hooked up, spark (shocked the sh** out of myself checking), fuel, and timing is on. So what next?

[9240sx]

Can you rev the engine?

[grey_240sx_man]

NO.

[9240sx]

Sounds like it might be a MAF problem,Check the voltage.

[grey_240sx_man]

I hope your right. What should the voltage be, and from what wire. Oh, and what is the cylinder compression for a redtop? I just did a compression test and it came out 155-160-160-160.

[grey_240sx_man]

That compression test is cold too. I can't keep the car running for more than 10 secs before it dies.

[S13240]

I hope your right. What should the voltage be, and from what wire. Oh, and what is the cylinder compression for a redtop? I just did a compression test and it came out 155-160-160-160.

Compression looks good, although it is quite high for a cold compression start. But it still looks like you have a vacuum leak especially when it's trying to idle at 5-10. Check for leaks on your air intake after the maf or bypass valve/blow off valve?

[grey_240sx_man]

I just realized I probably did the test one crank too much. I did a reading at 4 strokes and 5. On four strokes it did 150-155-155-155. OH, but my question is, could I have some some open vacuum source on the back of the intake manifold that needs capped. It doesn't have the egr connected, but when I took it off it wasn't hooked up to anything except to the stock egr tube from the turbo elbow. I hate only having the manual for an s14.

[S13240]

No chance for you to have an open vacuum source in back of the intake manifold. Should try a leakdown test.

[Luke]

The only vacuum source I can remember at the back of the intake side was connected to the brake booster line (next to the master cylinder). I removed my EGR and used a bolt cap.

[getnrowdy23]

if you cant rev past ~~2500 then it is a maf (it will seem like there is a governor at 2500)

[grey_240sx_man]

Dude. I can't keep it going whether it is plugged in or not. Not to mention rev past 2500. It will not idle at all. And I mean no vacuum leak seems to be the problem. Its weird. I'm begginning to wonder if it is an ecu problem or the IACV-ACC. I tried to adjust that skrew to open it more and it didn't help it idle any better.

[grey_240sx_man]

Still having the same problems.. I got to rev up and I tried to hold it at 2 -2.5k and just instantly the car will just cut out. No sputter just die. I checked the ecu code. I get a code 55, (Other Malfunction, CONSULT Terminal Required). I've read that it is also the default all good code. I don't know. Checked the maf, tps, and o2 sensors. With a multimeter tested about everything I could. What else do you think it could be guys?

[Luke]

I had the same problem when I first did my swap. I checked MAFS a million times, and even swapped with a known working MAFS from a SOHC KA24E. It turned out 2 MAFS signal wires were cut on the harness by a zip-tie. I soldered the connection back together and everything worked 100%.

I would follow your MAFS wires from the MAFS all the way to the ECU and look closely for wiring problems. Most likely it's the solder connections from extending the MAFS wires initially during the swap.

[grey_240sx_man]

Does anyone know if you need the fuel pressure control module connected on the wiring harness. I just notice that a red and white wire from pin 105 wasn't hooked up by the ecm plug. Its cut like 5 inches away and fell into view today when I was playing with it. I couldn't find the other side of the wire either. ???? What do you guys think. I can't find anything in the manual about it.