Mitsubayati
06-22-2011, 01:54 AM
I've searched about this problem for quite some time and did a lot of diagnosis and trial work, but nothing has helped so I'd like to see if someone can come and help me.
Description of Problem: My car is a 1991 240sx. The motor is a rebuilt ka24de that I purchased off of a friend. the motor ran beautifully without a single hiccup just seconds before we started to pull it from the old chassis. So I know it ran perfect before I swapped it into my shell. Before swapping, I changed the oil pan for one tapped with a return line bung, changed the fpr for an aftermarket unit since my friend took his off of the motor, routed the vacuum lines differently, then added stock header , added the downpipe and the aiv system that was on my chassis originally. Not to mention, I connected the egr pipe to the mating opening on the header.
Start up: First time I went to start the motor, she fired up without a problem, fpr was pretty much already set at the correct pressure since it was a used item so that wasn't touched. When I went to gas it though, the instant i pressed down on the accelerator, the motor would bog and completely die or come close unless I let off again. If I played with the accelerator I could get the rpm to climb until around 2500 when it would stop hesitating and rev up like it did once before. If I leave the car to idle it will die in a matter of seconds. On top of that, if the engine was warmed up it would bog less but the problem was still noticeable.
What I have done so far: I have gone through just about all components related to spark. plugs, wires,cap and rotor, ignition coil were all replaced with working units from my dd. Nothing changed. Then the MAF was swapped with no change as well. Then I moved onto fuel. I checked the fuel pressure going into the injector rail, it would show good pressure and never drop when the motor was bogging so I assumed there was no problem with the fuel pump or fuel filter. On a side note,I replaced the fuel tank and fuel pump before i had the new motor in. They were used items and replaced the old tank and fuel pump since the car sat for so long. Today I pulled the motor out just enough to get at the vacuum lines. I routed them correctly after looking up every picture and diagram just to make sure I had the right setup. I put the motor back in place, bolted her down and same thing happened again. I was so sure it was the vacuum lines but they had no effect.
If anyone has any helpful suggestions, they would be greatly appreciated. If you know what you are doing and would like to come over that would be the greatest. If you are certified and can fix this I will pay you for your time. located in Norcal. I know its something simple because KAs are just stupid like that. Any help would be great. Thanks for reading.
Description of Problem: My car is a 1991 240sx. The motor is a rebuilt ka24de that I purchased off of a friend. the motor ran beautifully without a single hiccup just seconds before we started to pull it from the old chassis. So I know it ran perfect before I swapped it into my shell. Before swapping, I changed the oil pan for one tapped with a return line bung, changed the fpr for an aftermarket unit since my friend took his off of the motor, routed the vacuum lines differently, then added stock header , added the downpipe and the aiv system that was on my chassis originally. Not to mention, I connected the egr pipe to the mating opening on the header.
Start up: First time I went to start the motor, she fired up without a problem, fpr was pretty much already set at the correct pressure since it was a used item so that wasn't touched. When I went to gas it though, the instant i pressed down on the accelerator, the motor would bog and completely die or come close unless I let off again. If I played with the accelerator I could get the rpm to climb until around 2500 when it would stop hesitating and rev up like it did once before. If I leave the car to idle it will die in a matter of seconds. On top of that, if the engine was warmed up it would bog less but the problem was still noticeable.
What I have done so far: I have gone through just about all components related to spark. plugs, wires,cap and rotor, ignition coil were all replaced with working units from my dd. Nothing changed. Then the MAF was swapped with no change as well. Then I moved onto fuel. I checked the fuel pressure going into the injector rail, it would show good pressure and never drop when the motor was bogging so I assumed there was no problem with the fuel pump or fuel filter. On a side note,I replaced the fuel tank and fuel pump before i had the new motor in. They were used items and replaced the old tank and fuel pump since the car sat for so long. Today I pulled the motor out just enough to get at the vacuum lines. I routed them correctly after looking up every picture and diagram just to make sure I had the right setup. I put the motor back in place, bolted her down and same thing happened again. I was so sure it was the vacuum lines but they had no effect.
If anyone has any helpful suggestions, they would be greatly appreciated. If you know what you are doing and would like to come over that would be the greatest. If you are certified and can fix this I will pay you for your time. located in Norcal. I know its something simple because KAs are just stupid like that. Any help would be great. Thanks for reading.