Jump to content
SAU Community

Recommended Posts

Like I say all six coil packs are brand new. The misfire was happening before I change all coil packs and now when I get all brand new coil packs. The misfire continues to happen. After upon inspecting all six spark plug. There is one foul dry plug. Meaning that cylinder is what causing the car to run on 5 cylinders I change the foul spark plug an it happen again. That dry foul plug smell like fuel

So why isn't it the wiring to the coil?

It's very hard to explain something to people that don't want to listen Ben, but good on you for giving it a go. :P

We have only wasted more of his money, somehow due to his mechanics incompetence.

Hey everybody I am new to this website. I need help on my vq25dd. I was trying to take out the injector but rite now all the the injector is in the engine block hard to remove an I have already remove the fuel rail an everything else. Only the injector hard to come out. Can some please give me some assitance. Thanks

  • 1 month later...

man, what a tedious job! and kinda scary to pull down a perfectly running motor past a point where i was worried i would cause a bigger issue...

i couldnt get a final result as good as others. left the bits soaking in unleaded petrol for hours, then scrubbed, then high pressure cleaned. all the intake parts seem to have been stained, but the worst is gone. even the secondary intake butterflies were caked badly in at least a couple millimetres of crap.

guessing it would only have looked perfect if i let them soak for 24 hours or more.... or had them acid dipped. didnt have enough time left to do that.

egr valve now blanked off, manifold coolant heating pipes bypassed, no ecu faults have come up.

plenum spacer installed

all learn procedures worked first time. had a big cough and misfire when it first started which scared the sh*t out of me, but the procedures sorted that out

car now accelerates with 3 people in it at the same rate as it did with just me. fuel consumption to be monitored. no change in sound as far as i can tell.

just need an oil catch can to stop crank case oil blow back to cylinder 1 and 2

thanks to all for tips and pics which were a big help

A17BE4D3-1FDE-402C-9D02-BE9321FA6D47-202

079D45E1-D9BC-41B8-B6D1-CC00BE064BA5-202

A55A1CDC-A63D-48EF-829A-2D795E4ED0DB-202

Did you use the resistor method for blanking off your EGR? I had a Kinetix V+ plenum (that i'm now returning because when I ordered it I was unaware of the EGR valve built into the factory plenum), now I have the Motordyne 5/16" spacer coming and plan on blocking the EGR when installing the spacer. I cleaned the factory plenum (upper and lower) but still need to do the intake runners. How did you go about cleaning the butterfly valves? Scrapping and vacuum, or throttle/brake cleaner? I've also Seafoam'd the crankcase and fuel-system and have noticed significant performance increase but am looking forward to finishing this beast of a project and Seafoaming through vacuum lines to complete upper engine restore.

  • 11 months later...

Hi guys.

I know this is an old thread an not even sure if any of you are still around, however i wanted to thank you all for your input and comments, i brought a 2001 250gt with 130k on the clock and was surprised/ disappointed at the lack of performance and terrible fuel economy i was getting from it, i did some searching and came across this golden thread, i decided to tackle this project myself and started the tear down, scared myself shitless when i started it up the first time as i had left a vacuum hose off!, put it all back together and she is purring like new.

thanks again guys (and girls if any?!) you have all saves me much pissing around and money.

after a week i went back in and stripped the plenum again to see if any further buildup/ oil had collected (i like making my life hard) there was more oil in the bottom chamber and i decided i hadnt done it well enough the first time so decided to polish it all up and put in some iridiums while i was at it, got a great finish this time.

20150813 201412

20150813 201415

20150813 201433

20150821 203753

20150821 203805

20150823 093124

  • Like 1
  • 1 month later...

Hi guys I'm a newbie here . I bought a 300gt a few months ago and it was a bit sluggish so decided to clean the intake manifold up . Have done this and all back together now but the car won't start . It turns over and has compression and fuel and spark but just doesn't want to start. Has anyone else had this problem?please need help .....

Hi guys I'm a newbie here . I bought a 300gt a few months ago and it was a bit sluggish so decided to clean the intake manifold up . Have done this and all back together now but the car won't start . It turns over and has compression and fuel and spark but just doesn't want to start. Has anyone else had this problem?please need help .....

Check the vacuum hose running from the swirl valve solenoid (in front of the plenum) to the swirl valves (under the lower plenum), mine had a kink in it when i first put it back together and i had the same issues, reconnected it and sorted out the kink and it fired away as if nothing had happened.

  • 1 month later...

Did you unplug the loom? A few pages before mentioned about the ecu forgetting where the throttle is or something to that effect.

Glad I found this post too, gives me one more thing to do on the new car. Might stop throwing codes and pulling timing

  • 1 month later...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • I had 3 counts over the last couple of weeks once where i got stranded at a jdm paint yard booking in some work. 2nd time was moving the car into the drive way for the inspection and the 3rd was during the inspection for the co2 leak test. Fix: 1st, car off for a hour and half disconnected battery 10mins 4th try car started 2nd, 5th try started 3rd, countless time starting disconnected battery dude was under the hood listening to the starting sequence fuel pump ect.   
    • This. As for your options - I suggest remote mounting the Nissan sensor further away on a length of steel tube. That tube to have a loop in it to handle vibration, etc etc. You will need to either put a tee and a bleed fitting near the sensor, or crack the fitting at the sensor to bleed it full of oil when you first set it up, otherwise you won't get the line filled. But this is a small problem. Just needs enough access to get it done.
    • The time is always correct. Only the date is wrong. It currently thinks it is January 19. Tomorrow it will say it is January 20. The date and time are ( should be ! ) retrieved from the GPS navigation system.
    • Buy yourself a set of easy outs. See if they will get a good bite in and unthread it.   Very very lucky the whole sender didn't let go while on the track and cost you a motor!
    • Well GTSBoy, prepare yourself further. I did a track day with 1/2 a day prep on Friday, inpromptu. The good news is that I got home, and didn't drive the car into a wall. Everything seemed mostly okay. The car was even a little faster than it was last time. I also got to get some good datalog data too. I also noticed a tiny bit of knock which was (luckily?) recorded. All I know is the knock sensors got recalibrated.... and are notorious for false knock. So I don't know if they are too sensitive, not sensitive enough... or some other third option. But I reduced timing anyway. It wasn't every pull through the session either. Think along the lines of -1 degree of timing for say, three instances while at the top of 4th in a 20 minute all-hot-lap session. Unfortunately at the end of session 2... I noticed a little oil. I borrowed some jack stands and a jack and took a look under there, but as is often the case, messing around with it kinda half cleaned it up, it was not conclusive where it was coming from. I decided to give it another go and see how it was. The amount of oil was maybe one/two small drops. I did another 20 minute session and car went well, and I was just starting to get into it and not be terrified of driving on track. I pulled over and checked in the pits and saw this: This is where I called it, packed up and went home as I live ~20 min from the track with a VERY VERY CLOSE EYE on Oil Pressure on the way home. The volume wasn't much but you never know. I checked it today when I had my own space/tools/time to find out what was going on, wanted to clean it up, run the car and see if any of the fittings from around the oil filter were causing it. I have like.. 5 fittings there, so I suspected one was (hopefully?) the culprit. It became immediately apparent as soon as I looked around more closely. 795d266d-a034-4b8c-89c9-d83860f5d00a.mp4       This is the R34 GTT oil sender connected via an adapter to an oil cooler block I have installed which runs AN lines to my cooler (and back). There's also an oil temp sensor on top.  Just after that video, I attempted to unthread the sensor to see if it's loose/worn and it disintegrated in my hand. So yes. I am glad I noticed that oil because it would appear that complete and utter catastrophic engine failure was about 1 second of engine runtime away. I did try to drill the fitting out, and only succeeded in drilling the middle hole much larger and now there's a... smooth hole in there with what looks like a damn sleeve still incredibly tight in there. Not really sure how to proceed from here. My options: 1) Find someone who can remove the stuck fitting, and use a steel adapter so it won't fatigue? (Female BSPT for the R34 sender to 1/8NPT male - HARD to find). IF it isn't possible to remove - Buy a new block ($320) and have someone tap a new 1/8NPT in the top of it ($????) and hope the steel adapter works better. 2) Buy a new block and give up on the OEM pressure sender for the dash entirely, and use the supplied 1/8 NPT for the oil temp sender. Having the oil pressure read 0 in the dash with the warning lamp will give me a lot of anxiety driving around. I do have the actual GM sensor/sender working, but it needs OBD2 as a gauge. If I'm datalogging I don't actually have a readout of what the gauge is currently displaying. 3) Other? Find a new location for the OEM sender? Though I don't know of anywhere that will work. I also don't know if a steel adapter is actually functionally smart here. It's clearly leveraged itself through vibration of the motor and snapped in half. This doesn't seem like a setup a smart person would replicate given the weight of the OEM sender. Still pretty happy being lucky for once and seeing this at the absolute last moment before bye bye motor in a big way, even if an adapter is apparently 6 weeks+ delivery and I have no way to free the current stuck/potentially destroyed threads in the current oil block.
×
×
  • Create New...