1994 J30T Stalling

[g_lantern]

I've had my J30T for about 5 years now.
This year it started giving me some problems.
I had a day where it would not start no matter what I did.
The next day it started fine.
Had this happen about 3 times. Always seemed to happen when I didn't drive it for a day or more.
Finally started working normally, then one day it stalled on me while driving. Started right up though and worked fine.
Since then I've had it stall about 20 times. Randomly, at a stoplight, on the freeway while at speed and while giving it gas. Every time it has always started up fine as soon as I restarted it.

I've read the forums and tried most of the recommendations.

Computer is throwing no error codes
Fuel pump is working good. Pressure is right.
Changed fuel filter anyways
Cleaned MAF
Disconnected Theft Control System

Not really sure what else it could be?
Any suggestions?

When I first got the car, there was a problem with the ignition switch. Sometimes the accessories would work, sometimes they wouldn't. so I changed the switch and have had no problems since. I wouldn't think the same part has gone again already.
I've had a few of the more common problems before this happened:
Head Lights (Left one not working) in daytime running mode
Stereo not lighting up.

Thanks for any help.

[driverdriver]

Your no start condition-Does it happen after short trips?

If it does, it means the engine is flooding. Have you floored the gas and tried to start it?

The VG30DE engine was not designed for short trips or many stop and go trips. It needs to be fully warmed up and run.

[g_lantern]

It didn't happen after a short trip. Every time it seemed to happen after a day or two of not driving it at all.
I tried flooring the gas pedal to start it. It took forever but that is how it finally would up starting.
The no start doesn't seem to be an issue today, now it is just the random stalling.
Maybe she just needs a good long drive

[yodawill2000]

The hard starting and stalling on the highway seems to be a fuel issue.
Granted holding the pedal down on a cold start to get it going is most likely a flooding issue.
But stalling on the highway would be a different issue.
Fuel pump, Fuel filter , Maf or the Maf connector.
Pull the ECU codes and report back.
The how too is a sticky on the main J30 forum page.

[g_lantern]

ECU is giving no error codes
Fuel pump is working fine.
I just changed the fuel filter
I cleaned the MAF with contact cleaner.

now what?

[driverdriver]

Have you OHM tested your injectors? Are they clean? Is fuel getting through?

10 to 14 ohms is good. Anything above or below indicates injector failure. Injector failure usually doesn't throw a code, but one of the symptoms is lack of power and low rumble at idle that may be either faint or pronounced.

[g_lantern]

Hi,
No I haven't done that. Not sure that I know how.
If the injectors are a problem, would it run normal most of the time and then just stall? because that is what it's doing now.
Would running some injector cleaner through the tank help? (Guess It couldn't hurt)

[yodawill2000]

The intermittent thing sure makes me think the Maf Connector is flakey.
Clean all connectors and use dielectric grease before reconnect.

A good way to test is to start her up and wiggle the maf connector and see if the the rpm,s change.

[g_lantern]

Wiggling the MAF connector did not change the RPMs.
I've been driving it more (it was a second vehicle I used to drive only occasionally) and the stalling has become more intermittent. Only stalled once in the last 2 days.
Today though something strange happened. On the freeway the RPMs would not go above 2000. Engine started making a strange noise, like it was running on 3 cylinders. pulled over and even in park it would not go above 2000 rpms. Turned it off, and back on, and it ran fine. Drove the rest of the day without incident. Any ideas?

[1994 infiniti j30 190+]

your intermittent thing could be your injectors slowly failing. mine did that where it sometimes would run on 6 then suddenly middle of driving down to 4 then normal so your injectors could be toast. how many miles is on the car itself? i got six injectors from the junkyard from a low mileage j and put them in about 6 months ago and its still running great. that could also cause your rpms to not go very high when running cause it just wont have the power to get up very high. as driver said ohm test the injectors and report back. 10-14 is good. my intermittent injectors, some read under 10 and i even had one read 48 ohms lol not good. just touch the test leads on the injector connector and see what they read.

[g_lantern]

There's only 99,000 Kms on my J (so about 60,000 Miles)
Nice low mileage J in great shape (other than the random stalling) She's a real beauty too Black on black leather.
I'll try that.
I'll post the readings as soon as I get them.

Thanks again.

[Infinitiguy19]

What about pressure testing the fuel system and making sure no fuel is leaking past the fuel injector o-rings. Hook up the fuel pressure gauge as normal, make sure the car is warm and let it run for a min or so after fully warm. Shut the car down and make sure pressure is held for at least 10 min or more. If not then the Injector o-rings are leaking or there maybe a leak else where as well.

Any white smoke or fuel smell from the exhaust?

[driverdriver]

There's only 99,000 Kms on my J (so about 60,000 Miles)
Nice low mileage J in great shape (other than the random stalling) She's a real beauty too Black on black leather.
I'll try that.
I'll post the readings as soon as I get them.

Thanks again.

Mine is a rare black on black "gold package" car.

You stated km's, so I'm assuming your a canuck? Where are you at?

[g_lantern]

Just Ohm tested the injectors. All are between 12 and 14.
Thank god, I wasn't looking forward to dremmeling the plenum.
But I still have no idea what the problem is. One second it is running perfect, the next it won't rev over 2000, or stalls.
It really seems like it's running on 3 cylinders. The motor even feels like it's trying to twist in it's mount. Runs like an unbalanced washing machine. I really thought it would be the injectors...
As a further test I tried running it with 1 and then 2 injectors unplugged. The behaviour of the engine is NOT the same. so I guess that rules out the injectors.

Driver Driver. Yes I am a Canuck. Living in British Columbia (Chilliwack)
Is there any way to test the MAF? I've cleaned it with contact cleaner, and I've tried wiggling the connection when it's running, and that causes no problems, so it's not the connection.

Any Ideas??

[g_lantern]

Paul Wall,

There is a slight leak in the exhaust Manifold. but that has been there for years. Sounds a bit growly, but shouldn't be causing this problem.

[driverdriver]

Did you test your ignition coils by swapping them out?

[Infinitiguy19]

Paul Wall,

There is a slight leak in the exhaust Manifold. but that has been there for years. Sounds a bit growly, but shouldn't be causing this problem.

Maybe not but still should be rectified.

[g_lantern]

When I first had problems and took the car to the shop, they said they checked all the coils, and they were fine.
Not sure how they checked them.