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Nissan 300ZX, all models

171 messages,  Last post on Sep 22, 2009 at 11:44 AM

You are in the Classic Cars Forum. Your Host is mr_shiftright

What is this discussion about? Nissan 300ZX, Hatchback


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#83 of 171
Re: help please!!!!!! [300zx93] by Mr_Shiftright HOST
Jul 06, 2006 (6:14 am)
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Replying to: 300zx93 (Jul 05, 2006 9:58 pm)

Sounds like a small thing (good news) that might be hard to track down (bad news).
 
Given the random nature one might expect an electrical glitch. You could try a simple test and run your engine at night and look to see if there is spark leakage from your spark plug wires.
 
Otherwise, you might get the engine scanned to see if anything turns up. Possibly you'd have to get a mechanic to just tighten and clean all vital electrical connections. You might get lucky.
#84 of 171
Re: Jcliffro and Shifty [pap5] by zgirl
Jul 08, 2006 (9:26 am)
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Replying to: pap5 (Aug 05, 2002 3:21 am)

Hey there, I'm having a problem with my 91 Z, she's running hot, & when you turn on the air, the temp gauge goes to 3/4 & won't cool down. I've changed the thermostat, had the radiator flushed, also a new fan/clutch....any other ideas? There are no good mechanics around with the Z-touch. Z-Girl
#85 of 171
Re: Jcliffro and Shifty [zgirl] by Mr_Shiftright HOST
Jul 08, 2006 (9:58 am)
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Replying to: zgirl (Jul 08, 2006 9:26 am)

Sometimes a radiator flush doesn't do much good, if the radiator is clogged up from many years of use.
 
I don't recall on this car---is there an auxiliary electric cooling fan that is supposed to cut in with the AC on, in addition to the regular fan?
 
You know, 3/4 on the guage isn't necessarily a bad thing, as long as the car isn't overheating. Engines like to run on the hot side.
 
Also have you replaced your radiator cap? Any leak in pressure will drop the boiling point of water/coolant.
#86 of 171
Re: Jcliffro and Shifty [Mr_Shiftright] by zgirl
Jul 08, 2006 (10:26 am)
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Replying to: Mr_Shiftright (Jul 08, 2006 9:58 am)

The flush was discussed last nite. I was told if they didn't do the flush thru the engine, bottom up, something may be stuck in there..... the guy who did it... I don't know......thought of bringing it in to an express place, they do a complete flush for $65.00
Yes there is an auxiliary fan for the a/c, it comes on & works. And now you mention it, the flusher guy did replace the cap. But running at 3/4, it smells like it's hot, it's close to an overheat... that's just too hot, & why after 6 summers did it run at 3/8 & now it's up there? I know they like to run hotter, but really, that it too hot. Ok, I just had it out & about for 1/2 with the air on, it's at 3/8 ! This doesn't make sense.
#87 of 171
Re: Jcliffro and Shifty [zgirl] by Mr_Shiftright HOST
Jul 08, 2006 (10:29 am)
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Replying to: zgirl (Jul 08, 2006 10:26 am)

There may be a procedure for filling the radiator to prevent air pockets in the coolant. Some cars are pretty touchy about this.
 
As for the radiator, often they must be taken out and cleaned chemically or replaced. I think a radiator shop could flow test it and then you have a definitive answer.
 
Generally speaking, if you overheat while at idle, it's an air circulation problem and if you overheat as you drive, it's a water circulation problem.
#88 of 171
Re: Jcliffro and Shifty [Mr_Shiftright] by zgirl
Jul 08, 2006 (10:46 am)
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Replying to: Mr_Shiftright (Jul 08, 2006 10:29 am)

Got it. I'll make an appointment at a radiator place. As for an idle, it can sit for an hour with the air on, & it doesn't move. Get on the highway & it's touchy. Like I said, I just cruised down the country roads doing 80 with the air on & it's perfect. One thing I question is that it is hot today, 87, as it was yesterday, but it's not humid today.... my old 97 Nissan Pulsar was touchy on damp & humid days... just weird stuff. That one went bye-bye last year with 240,000 miles still running strong, but the suspension had many hairline cracks, it was time to take it off the highway! Thanks for your help. I'll check back in next week after I get a REAL flush!!
#89 of 171
Re: Jcliffro and Shifty [zgirl] by Mr_Shiftright HOST
Jul 08, 2006 (3:15 pm)
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Replying to: zgirl (Jul 08, 2006 10:46 am)

Okay then, it's a coolant circulation problem definitely. New fan clutch was a waste of money and a bad guess...fire that mechanic.
#90 of 171
Starting problems by skilman31
Jul 08, 2006 (9:52 pm)
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When i start my car it seems to have trouble u have to press the gas just to get it not to stall and then it takes around 2 min of driving till it is totally warmed up and it has been eating gas like crazy i am getting around 18 miles to the gallon it also seems like my turbo isn't kicking in like it use to be anyone have any suggestions on what i should do ? oh and i have a 1984 300zx with a turbo ! Thanks
#91 of 171
Re: can u help me? [jenny6] by sidekickdenver
Jul 20, 2006 (5:35 am)
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Replying to: jenny6 (Apr 13, 2006 7:02 pm)

I am having a similar problem, and was curious if you found the problem. So far the alternator has been replaced, the fuel system checks out the injector signal checks out, replaced the air flow meter, no change, the car runs for about 15 minutes and then dies and refuses to restart.
#92 of 171
Re: can u help me? [sidekickdenver] by skilman31
Jul 22, 2006 (9:47 pm)
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Replying to: sidekickdenver (Jul 20, 2006 5:35 am)

Well have u checked ur computer to see if it is giving out any codes ? I know that mine insnt and that is the prob. I think it might be electrical or at least for u it sounds like it one think to check is the fuel pressure regulator that controlls weather it can run after long periods of time and temps and sutch but also when my car first ran like that it was the comp was in dionostic mode so that made it so that it didnt want to run at all so check that plus like i said see if it is giving out any codes from the comp !

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