Well, I have a J30 with a VG30 motor. It as 115,000 miles. It was running great until recently.
The car is at the menhanic. THe two front cyclines (1 & 3) on the passenger is misfiring and white smoke, not gray, is comming out the back. He replaced all the fuel injectors. Still having the same problem.
We are puzzle to want the problem can be?
Your help would be greatly appreciated.
Regards,
Frank
Having problems with VG30 engine
year of car? if its early 90s I would say tinger with the trig unit on the front of the engine see if that clears it up. white smoke is usually an indication of head gasket but it is serious thick white smoke and it bellows out the back like a geyser. if this smoke is fairly thin and see through I would say its fuel vapor. the trig unit and the cam position sensor connectors on these are notorious for corrosion probs in the connectors. I know the 90-91 Z car(same engine) had a bulliten or recall on the trig unit back in 92 or 93. may apply to the infiniti J30 as well
I just read your post in online infiniti regarding this with the complete info.got a couple of questions regarding your repair. Did you mechanic change the oil to remove the gas from the crank case? Did he clean or replace the fouled spark plugs? these things need to be done when you cylinders wash down. in addition to what i recommended above check your coolant temp sensor connector for corrosion in the terminals. #1 cause of Z car cold start issues.
there have been a couple of issues doing the injectors in our shop with inexperianced techs working on injector repairs for the z car VG30DE engine. The seals at the bottom do not get seated properly and the result is fuel leaking into the cyl. Had to go in and redo the job myself on both incedents. It is vital when installing those injectors you clean any of the remaining sand type particals from the injector bore in the rail also to slide them in perfectly straight and have adaquit lubrication to asist it.
there have been a couple of issues doing the injectors in our shop with inexperianced techs working on injector repairs for the z car VG30DE engine. The seals at the bottom do not get seated properly and the result is fuel leaking into the cyl. Had to go in and redo the job myself on both incedents. It is vital when installing those injectors you clean any of the remaining sand type particals from the injector bore in the rail also to slide them in perfectly straight and have adaquit lubrication to asist it.
Hi Nistech,
It sounds like your a Nissan mechanic. Is it possible for you to call my mechanic? He is a good guy. I will pay for your time that you spend to speak to him. I can conference you two together. It won't cost you a phone call.
I can send you personal check or paypal or whatever for your time. I just need some help from an experience Nissan mechanic.
Please let me know. Thanks
Regards,
Frank
It sounds like your a Nissan mechanic. Is it possible for you to call my mechanic? He is a good guy. I will pay for your time that you spend to speak to him. I can conference you two together. It won't cost you a phone call.
I can send you personal check or paypal or whatever for your time. I just need some help from an experience Nissan mechanic.
Please let me know. Thanks
Regards,
Frank
whats the shops # and the mechanics name and hours in your time zone? now be forwarned I have a terrible time understanding people with accents so If he has a horrific east coast accent I may have a hard time understanding him. I now the words "Ima" and "jewsin" so i might be ok....lol I am willing to make a breif call to him. dont sweat payin me.
HI NISTECH,
First, I want to thank you so much. I spoke to my mechanic. He said you are awesome. You pin pointed the problem to a connection issue with the power transistor unit. I think I had a fuel injector issues too; but at least, they are all new now.
He resecured the connection and the miss firing and white smoke problem went away. I let him drive it around this weekend and the car drives fine, be the check engine lite came on and he is looking into it.
In the future, do you recommend using CRC Contact Cleaner and Di-Electric Grease on the connectors. I am noticing the connector problems can be a big problem with Nissans.
I want to thanks you again for your efforts. It is greatly appreciated.
Regards,
fxgo
First, I want to thank you so much. I spoke to my mechanic. He said you are awesome. You pin pointed the problem to a connection issue with the power transistor unit. I think I had a fuel injector issues too; but at least, they are all new now.
He resecured the connection and the miss firing and white smoke problem went away. I let him drive it around this weekend and the car drives fine, be the check engine lite came on and he is looking into it.
In the future, do you recommend using CRC Contact Cleaner and Di-Electric Grease on the connectors. I am noticing the connector problems can be a big problem with Nissans.
I want to thanks you again for your efforts. It is greatly appreciated.
Regards,
fxgo
Hi Nistech,
You are awesome again. The check engine light was a vacum hose problem with the EGR value. He fixed it and the car is running fine. He said you told him to check the EGR hoses.
Man, what a long road on this repair.
On another note, this cars timming belt was replaced at 40,000 miles. I found this out by the VIN check at the dealer.
This means that I will not have to replace the timming belt until 145,000 miles. How close to the 105,000 miles can one go before replacing the timming belt. What about the water pump?
Thanks again for all your support.
Regards,
Frank
You are awesome again. The check engine light was a vacum hose problem with the EGR value. He fixed it and the car is running fine. He said you told him to check the EGR hoses.
Man, what a long road on this repair.
On another note, this cars timming belt was replaced at 40,000 miles. I found this out by the VIN check at the dealer.
This means that I will not have to replace the timming belt until 145,000 miles. How close to the 105,000 miles can one go before replacing the timming belt. What about the water pump?
Thanks again for all your support.
Regards,
Frank
the zcars timing interval is 60k and that is the same engine thats in your car. be sure your owners manual says 105k. either way follow the service manual as close to the milage as possible. because if the belt were to break you would have valve to piston contact which will require rebuilding or replacing the heads. Not worth the risk. Now the water pump is as needed. So if it shows signs of a leak during t-belt replacement replace it if it doesnt show signs of a leak you dont need to but that would be up to you if you just wanted to do it as preventive maint.
OYes, the service manual does state 105,000 miles. In the 93 J30, the timing interval is 60,000. On the 94 J30 and above, the timing belt interval is 105,000. Infiniti switched to a kevlar belt from a rubber belt.
So theoretically, if a person who owns a 90-96 zcar needs to replace a belt, they should replace it with a 94-97 J30 timing belt. This will increase the mileage between belt changes.
It nice to know that my engine is an interface engine. I will replace is at the recommend interval.
It is going to so sweet to drive my J30 again. It has been awhile.
Again NISTECH, thanks again for all your help. You are awsome man!!!
So theoretically, if a person who owns a 90-96 zcar needs to replace a belt, they should replace it with a 94-97 J30 timing belt. This will increase the mileage between belt changes.
It nice to know that my engine is an interface engine. I will replace is at the recommend interval.
It is going to so sweet to drive my J30 again. It has been awhile.
Again NISTECH, thanks again for all your help. You are awsome man!!!
Well, my problem is back. It looks like the problem is with the contacts on the power transistor unit. The mechanic didn't use dielectric grease on the connectors.
Does it need heat sink compound between the pluem and the back of the unit?
Should I get a unit purchase a new Power Transitor unit or just my dremil to clean the contacts?
Thanks in advance -frank
Does it need heat sink compound between the pluem and the back of the unit?
Should I get a unit purchase a new Power Transitor unit or just my dremil to clean the contacts?
Thanks in advance -frank
I wouldnt use a dremil you might take some of the pin material off as well. There are a couple products you can use to clean the terminals one is battery terminal cleaner but also if you have access to acid detailers use to clean engine components that will disolve most of the crust. then you can scrape it a little to get the heavier build up off then rinse it with water to clean it up. Dont let the acid sit in there to long or it will eat away at the pins. blow it out with air apply your dielectric grease and it should be good to go. You may need to tighten the terminals in the connector a bit by bending them in a little to get a tighter fit on the male terminals.
I can't see any adjustments on the terminals itself. I don't want to take any chances. The funny thing is I don't see many people having this type of problem.
I will take your second advise and replace the unit. I will then use CRC contact cleaner and dielectric grease. When installing the new unit, do I need to use heat sink grease on the back of the unit then mount to manifold bracket? The back of the unit is medal. There is no installation instructions in the service manual.
Thanks so much for you help.
Regards,
fxgo
I will take your second advise and replace the unit. I will then use CRC contact cleaner and dielectric grease. When installing the new unit, do I need to use heat sink grease on the back of the unit then mount to manifold bracket? The back of the unit is medal. There is no installation instructions in the service manual.
Thanks so much for you help.
Regards,
fxgo
to tighten the terminals you use a scribe to bend the female portion in a little bit. this is providing you have the square large black plugs and not the large gray rounded edge plugs. As far as compound on the back dont know if they did that on the J they didnt on the Z. If it has a white substance on the back side of the old one then yea definitly put some on it.
Hi Q45tech,
Yes, I would agree with you. The problem was there before I purchased the car. There was a crack on the Power Transitor unit and the previous owner/mechanic put silcone to seal it. I replace it with a part from a junk yard. It works but I have connector issues. I did find a trustworthy mechanic, but he was more a toyota specialist. I put more importance on trustworthy.
I would love to find a trustworthy private Nisson specialist. If there was a T3 or Nistech like shop here, I would be a customer. Finding a mechanic you can trust is not easy and on top of it a Nissan specialist. In my area, I have better luck finding Lexus/Toyota or Honda specialists.
If anyone knows of a privately owned trustworthy Nissan specialist in CT. Please let me know.
Thanks again.
Yes, I would agree with you. The problem was there before I purchased the car. There was a crack on the Power Transitor unit and the previous owner/mechanic put silcone to seal it. I replace it with a part from a junk yard. It works but I have connector issues. I did find a trustworthy mechanic, but he was more a toyota specialist. I put more importance on trustworthy.
I would love to find a trustworthy private Nisson specialist. If there was a T3 or Nistech like shop here, I would be a customer. Finding a mechanic you can trust is not easy and on top of it a Nissan specialist. In my area, I have better luck finding Lexus/Toyota or Honda specialists.
If anyone knows of a privately owned trustworthy Nissan specialist in CT. Please let me know.
Thanks again.
Hi Nistech,
I have the large gray rounded connectors. I didn't take the other unit out, so I don't know if it had heat sink compound. It looks like there is dielectric grease on it. The funny thing, I ask the last mechanic if he used dielectric grease and he said he did. I think I know were we put it. Eitherway, he is a good mechanic. He just doesn't have lots of Nissan experience.
I will order the part and do what I said above and get the job done; but I will put a harder effort in finding a trustworthy Nissan specialist.
I want to thank you for all you help. I wish I was closer to give you my business. You never know. I could move.
Thanks again.
Regards,
fxgo
I have the large gray rounded connectors. I didn't take the other unit out, so I don't know if it had heat sink compound. It looks like there is dielectric grease on it. The funny thing, I ask the last mechanic if he used dielectric grease and he said he did. I think I know were we put it. Eitherway, he is a good mechanic. He just doesn't have lots of Nissan experience.
I will order the part and do what I said above and get the job done; but I will put a harder effort in finding a trustworthy Nissan specialist.
I want to thank you for all you help. I wish I was closer to give you my business. You never know. I could move.
Thanks again.
Regards,
fxgo
Well, I put the part it seems to have fixed it, thanks, but now I have a new problem. I am getting a check engine light.
Since this is a J30 and a separate problem, I am going to create a new thread and the Infiniti section. Below is the link:
http://nissaninfiniticlub.com/...66003
Since this is a J30 and a separate problem, I am going to create a new thread and the Infiniti section. Below is the link:
http://nissaninfiniticlub.com/...66003