1990 Q45 Help

[jshawsocal]

Hey guys my 1990 Q starts and runs fine but when I shut it off it will not start again, it will crank over but will not start. If I wait about an hour or 2 it starts right back up. Any ideas would be extremely helpful.

[maxnix]

Well first, welcome to the forum. Might want to go to the Infiniti Online Mechanic Forum and post. But before you do, try a few searches. Also, a maintenance history, account of the vehicle's condition and a complete description of when and how the problem occurs will help the more experienced memebers here diagnose your cars beahvior.

Are you speaking of starting it cold, running it less than 3 minutes, then trying to restart it 20 or more minutes later?

[squeefoo]

Mine did the exact same thing when the pinmelted the solder joint in the FPCU. If you open the trunk does it start sooner? Does the fuel pump make the death rattle (buzzing)? If so the ground pin overheats and melts the solder. Do a search and the truth will find you.

[Q451990]

Another possibility is that you have a leak-down issue on an injector or two - causing flooding. I agree with Squeefoo that it's probably a fuel pump issue.

Heath

[jshawsocal]

Thanks for the welcome, And yes it is after a cold start and runs for less than about 5 minutes. Thanks for the advice.

[maxnix]

Then the gasoline rich start-up is washing your cylinders of lubrication, and it is not run long enough to be brought up to proper operating temperature. Therefore, when you try to restart after only a short interval, there is no compression because there is no oil on the cylinder walls. Wait 20 minutes, and the excess gasoline will evaporate and the cylinder walls will lubricate again and you have compression. Not at all uncommon.

Best guess unless we get some more data.

Be sure to spend the next few nights reading the previous posts. Any Q45 owner on this board who truly desires to understand how the car functions must read all of Q45tech's posts. All of them.