Volchok
02-14-2009, 11:26 AM
Hey everyone, need some more advice from the experienced zilvian community. Need some suggestions, trouble shooting tips.
I just installed a new T28 w/ circuit sports steel lines, 550's, Z32 MAF, Greddy oil pan, oil cooler and intake, Megan Pulleys, Nismo motor mounts, AEM wideband, and sbc i-color boost controller. I pulled the motor to do all of the upgrades, and everyhting went pretty smooth. After the motor was back in, and everything was hooked up, i took it for a drive, everything seemed great. I hadn't yet put the clutch fan on, so I made the drive short, to warm up the engine, get oil flowing through the oil cooler and then check for leaks. Everything looked great no leaks, and it ran strong.
The next day I installed the clutch fan and shroud, and then a Circuit Sports downpipe so I could hook up the AEM wideband sensor. Then I put on a HKS Hi Power exhaust and Megan test pipe. I had cut out the muffler on the exhaust so it is just a 3in pipe all the way back.
I went to start it to see how the exhaust sounded and check the readings on the wideband. Sometimes the car can take a few to start it up, but this time it took a really really long time. When it finally did start, it was running really rough. It does to idle OK but starts to sputter and cough and gasp for air it seems when you give it gas, and there was a lot of white smoke coming out of the exhaust. When you floor it it bogs down, putter and even backfires. It was late and out of frustration, I gave up for the night.
The next day it did the same thing. These are the trouble shooting things I've done so far:
1.) I removed the spark plugs and cleaned them with a wire brush, there was some black deposits on them, and they are less than 5,000 miles old.
2.) I checked the ground on the Z32 MAF which was good, also the power was ok to the plug.
3.) Checked the power and ground to each of the fuel injectors which was also good.
4.) dumped all of the oil, and refilled to exactly 5 quarts after filing up the oil cooler core.
5.) checked for boost leaks which i didn't find, and the boost gauge is registering boost on throttle, however it jumps around as the RPM's jump a bit since it is running rough.
Thats it so far. Today i have a friend bringing over a different MAF and ECU. , the MAF I bought was used from here on zilvia, and the ECU was just tuned by Enthalpy. The only things I could think of were a bad MAF or ECU tune.
The strangest thing is that it ran great the first day. I have no idea what has happened since then. I am going to even pull off the exhaust from the downpipe to see if that does anything, as it is the only thing that changed. I don;t see how it could but I am running out of ideas and am desperately trying to make a drift event next weekend.
Any help would be appreciated more than you could imagine. This is the first time in a year my car hasn't been running and I am obsessively distraught over it!!! I barely slept last night.
Thanks!!!
I just installed a new T28 w/ circuit sports steel lines, 550's, Z32 MAF, Greddy oil pan, oil cooler and intake, Megan Pulleys, Nismo motor mounts, AEM wideband, and sbc i-color boost controller. I pulled the motor to do all of the upgrades, and everyhting went pretty smooth. After the motor was back in, and everything was hooked up, i took it for a drive, everything seemed great. I hadn't yet put the clutch fan on, so I made the drive short, to warm up the engine, get oil flowing through the oil cooler and then check for leaks. Everything looked great no leaks, and it ran strong.
The next day I installed the clutch fan and shroud, and then a Circuit Sports downpipe so I could hook up the AEM wideband sensor. Then I put on a HKS Hi Power exhaust and Megan test pipe. I had cut out the muffler on the exhaust so it is just a 3in pipe all the way back.
I went to start it to see how the exhaust sounded and check the readings on the wideband. Sometimes the car can take a few to start it up, but this time it took a really really long time. When it finally did start, it was running really rough. It does to idle OK but starts to sputter and cough and gasp for air it seems when you give it gas, and there was a lot of white smoke coming out of the exhaust. When you floor it it bogs down, putter and even backfires. It was late and out of frustration, I gave up for the night.
The next day it did the same thing. These are the trouble shooting things I've done so far:
1.) I removed the spark plugs and cleaned them with a wire brush, there was some black deposits on them, and they are less than 5,000 miles old.
2.) I checked the ground on the Z32 MAF which was good, also the power was ok to the plug.
3.) Checked the power and ground to each of the fuel injectors which was also good.
4.) dumped all of the oil, and refilled to exactly 5 quarts after filing up the oil cooler core.
5.) checked for boost leaks which i didn't find, and the boost gauge is registering boost on throttle, however it jumps around as the RPM's jump a bit since it is running rough.
Thats it so far. Today i have a friend bringing over a different MAF and ECU. , the MAF I bought was used from here on zilvia, and the ECU was just tuned by Enthalpy. The only things I could think of were a bad MAF or ECU tune.
The strangest thing is that it ran great the first day. I have no idea what has happened since then. I am going to even pull off the exhaust from the downpipe to see if that does anything, as it is the only thing that changed. I don;t see how it could but I am running out of ideas and am desperately trying to make a drift event next weekend.
Any help would be appreciated more than you could imagine. This is the first time in a year my car hasn't been running and I am obsessively distraught over it!!! I barely slept last night.
Thanks!!!