Question about 1993 Nissan 300ZX

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Won't start car will turn over, but does not start, I have good fuel pressure, spark. when problem started last week, it sometimes started, and sounded like it was starving for gas, as i opened throttle a little,and pumped gas a little it went to normal high idle. I have good pulse on injectors , and also switched out mass air, but it didn't make andy difference----it would just turn over, thanks lenny

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  • Anonymous Mar 23, 2014

    motor starts, but when given gas it dies. There's a hissing noise coming out the tail pipe. And it sounds like it's starving for fuel.

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Also if your friend wants his sensor back i have a spare engine and sensor... ill give it to you if you need it. on the cas make sure that it isnt just turned all the way to the right or left. it should be adjusted so that the 3 holdiong screws are in the middle and slightly to the left.. good luck it would help if you had a timing light.

Posted on Jan 09, 2009

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If there is someone near you with a Z, see if you can swap your cam angle sensor with theirs as a troubleshoot. The CAS is the round metal sensor on the front of the engine, driver's side, coming through the timing belt cover. It has one electrical connector coming into it. It is possible that the CAS is going bad, and if so it could cause the problem.

Also, the one recall for the 90-96 300ZX was the PTU, power transistor unit. It's the small black box on the passenger side timing cover, with a 6-7 wire harness coming in one side, and out the other. The early ones were known to overheat and fail, and the car would start intermittently or not at all. Your car likely has the updated version of it, but it can still fail. It would be worth trying to swap that as well, to see if that fixes the issue. If either of them do, you can buy that part from www.z1motorsports.com either new or used, and install it.

A note with the CAS - it's keyed to go on in one position only, but since the cams rotate at half the frequency of the crank, if you install it and the car starts, then peters out and dies, then you have it 360 degrees out of phase. Remove it, spin the shaft one full revolution, and reinstall it, and it should run.

Posted on Jul 22, 2008

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Car won' start, battery is ok, antifreeze is low but not out could this be the problem?


No. it wouldn't keep it from starting. If the engine cranks but won't start, probably gas or spark (ignition) related. Do you hear the fuel pump in the tank turn on for a couple of seconds, when turning key to on, not start? If you cannot hear the pump, better check if you are getting gas up to the engine. Maybe the fuel pump quit, or the pump circuit needs looked at. The pump should briefly turn on with key on to pressurize the fuel system-the fuel line and the fuel rail where the injectors are. Then the pump will turn off, and only come back on again when the engine is cranking, and stay on when running.
Correct fuel pressure is important for easy starting, and good engine performance. Have the fuel pressure checked against the specification for your vehicle. If fuel pressure is good, check the ignition system-check for spark.

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1995 Lexus LS400. Car was left in garage for two weeks while we were on vacation. Upon return it won't start. Engine does turn over. Replaced fuel pump in attempt to troubleshoot. Mechanic ha


I assume the pump was replaced because it was getting power but no fuel pressure ?
Are you still not getting fuel pressure ?
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My 91 GMC Tracker sometimes won't start and other times starts just fine. It also shuts off randomly.


i daily driver, or just took out of a barn for winter duty.?
context? when did it run right last, 1day, 1week or 1 year.ago.?
sounds Canada , nobody ever posts location, and guess what
canada is not texas. 85F today here. and all week.
fuel antifreeze is just methanol. it works,

stalls, are complex.
so are won't start.
the EGR sticks open on most , its a 50k service point and is never done by most owners. and fails like clockwork.
first use test fuel, does test fuel work , when it wont start.?

did you read the spark plug tips to see if its flooding or starving for fuel.
did you do the fall tuneup. make sure spark is good?
really fast starter,, that is odd.
so your saying it always starts eventually but not always
and when it does run, its with full power on hills, etc?
Id do the 60k tune up on it.
see it here.
http://www.fixkick.com/IGN_timing/tune-ups.html



if it wont start, try the op guide rule,crank WOT (unflood mode)
wide open throttle, this cuts all fuel injection and clears all floods.
if not flooded and spark is good (tuneup) and new fuel filter.
then try test fuel. on a good engine and good spark engine.
I remove a intake hose, and spray it in there.
and crank , does it start now, for at least the life of the test fuel>

http://www.youtube.com/watch?v=064Ilsz8Fzg&feature=player_detailpage#t=0

Jan 01, 2013 | 1991 Geo Tracker

1 Answer

Last week her trooper just died,wouldn't startt.We changed the fuel pump it ran for a week again it won't start.


Did you check the fuel pressure before all of this fuel pump replacement? If the fuel filter is old enough to be clogged up, it should have been changed long before replacing a fuel pump unit. Your fuel filter should be changed every 30,000 miles. However, it would have to be TOTALLY clogged up to keep the engine from starting. It would have been causing all kinds of drivability problems LONG before that could happen.

Then, has anybody bothered to check for spark when the engine will not start? Has anyone scanned the onboard computer? (which happens to be in full control of both the fuel system and the ignition system)

You just might be trying to repair the wrong system...

There is no way anyone online can accurately tell you why it will not run without checking the vehicle first....although many uneducated DIYers might GUESS for you...which seems to be just as good as you are already doing....

PROPER DIAGNOSIS REQUIRED!

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1 Answer

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If this is a sudden occurrence and nothing suspicious happened prior, you most likely lost either gas or spark to the engine. You need to check for both.

Do you hear the fuel pump in the gas tank buzz on for a couple of seconds when you turn the ignition key to ON? Unless the fuel pump turns on and puts gas under high pressure at the fuel injectors, the engine cylinders won't get gas to start. Correct fuel pressure is crucial to know if you have a fuel pump (or fuel filter) problem. If the pressure is correct, it is probably not a fuel problem but a spark problem, although there are less common instances where a fuel injector circuit may malfunction.

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