Question about 1988 Nissan 300ZX

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300zx wont start changed cas and ptu and ecu no luck

My 94 300zx just wont start have changed crankangle senor and ptu also ecu no luck car turns over very well and still no luck getting plenty of spark plenty of fuel all wireing seems fine starter has been changed also got it pluged into a dianostic machine it came up primary ignition circut error any ideas as to wats wrong before i brun my car ps. no vac leaks

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SOURCE: my 94 300zx tt wont start changed ecu cas and ptu

check timing, see if belt may have slipped out of timing, and need pressure tester to test pressure where the fuel goes into the fuel filter. check for vaccuum leaks.

Posted on Feb 17, 2009


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Car will not turn start after crank senor was changed car is get spark and gas but wont start

Did it start before sensor was changed? Ever hear "Dont fix what aint broke? I'd guess New sensor is not installed correctly, not connected correctly, perhaps wrong part or other unknown issues.
Are there any error codes? Could be, in changing the ECU didn't like the process and stopped everything. Codes may need to be reset. You may be able to do that by disconnecting the battery overnight.

Feb 27, 2015 | 1997 Ford Escort

1 Answer

How do I line up my cas sensor on my ca18det properly? And if it's out by much would that cause my car to splutter when driving?

Crank angle sensor =CAS DTC code 11 .
Cam angle sensor = CAS s work best. for sure.
i think this engine it is both !
there is no distributor it has 4 COPs coil over plug
and 1 ignitor module l , that nissan calls the power transistor pack. or PTU, the CAS on this car is really 2 sensors in one.
1 for cam angle and TDC (its a bit sloppy but back then no OBD2 rule to kill this idea)
they call it the crank sensor but is connect to the cam.

what car, what year, ? what country?

and sputter yes.
why not post exact year and car body mode.
or do like we all do
and log in and read the CAS timing , on your car. or buy the FSM.

here is the lest of cars using this engine.
The 1.8 L CA18DET was the last version of the CA engine to be released. It produces 167 hp (124 kW) and 166 lb·ft (228 Nm). It received a brand new DOHC aluminum head with 16 valves. The turbocharger was also upgraded to a Garrett T25 (.48 A/R) unit for increased flow capacity, and as such, was fitted with an intercooler to help prevent the onset of pre-ignition and/or detonation. Fuel was delivered via Multiport Fuel Injection. Bore is 83 mm (3.3 in), and stroke is 83.6 mm (3.29 in). An electronically controlled fuel injection system was used with 370cc injectors.
It was used in the following vehicles:
we run a 200sx in South America. Custom Turbo. ECU and all.

Our engine CAS sensor, has slots see them?
see it.

This engine has no timing freeze DLC (check-conn)like most engine.
hot normal idle speed, set it to FACTORY spec. 15deg. BTDC
do not guess. the ECU hates that. it assumes it is correct
and if not, will mess up big time. Set it to spec. and LEAVE IT.

if you dont have an FSM or a book showiing how to set timing
ask for one, buy one, or google for it.

if a turbo, and you guess, 4 cracked pistons is your future.
here is the fRee FSM
see page EC22 for spark timing.

down load the zip extract it the PDF is the shop manual.

did you run the ECU diagnostics, yet?, RTM.?
for IS the Check engine lamp glowing running?

toy and nissan have the best FSM , of all.
very BIG on diagnosis, unlike USA cars.
the ECU has switch see that?
and if a crank or cam sensor misfires, it will tell you it did.
I'm sure.
the ECU has 5 modes of diagnosis. a very nice ECU.
page 186

Now the real TOPIC :

Misfire is 50 reasons or just 3, (micro, and macro viewed logically
1: bad engine , low compression on any cylinder or all (timing belt slip is all) 150 PSI is minimum. for me. RTM
2: bad /weak/timed wrong, spark. (cas set wrong) test spark on all cylinders. and set the timing, if found way off the cam belt slipped)
never doing a 60,000 mile tune? duh factor 1?
3: bad fueling. too rich turns spark plugs (new?) black. and misfires.
lean fueling causes, bogging and lost engine power.
flooding can be caused by may things, it is , ask how to find this easy.

misfire causes the engine to shake does it?

ever consider a new cam timing belt, or do you want to risk it snapping or slipping?
all Nissans are interference engine. if the belt slips BAM, kiss off a nice motor.

May 24, 2014 | Cars & Trucks

2 Answers

300zx wont start has spark plugs are wet

Wet spark plugs indicate cylinder flooding and the existence of a no spark condition.

Check your fuel and ignition systems for proper operation and repair/replace components as necessary.

Dec 25, 2009 | 1993 Nissan 300ZX

1 Answer


try to start the car and unplug the coil packs one at a time. listen for changes in the way the car runs. it sounds like you have a dead cylinder or two. be aware of VERY small changes in the sound as i had mine running on 2 of six cylinders and it still ran. if you notice that you have a dead cylinder check the coil packs for corrosion on the connectors if they are fine. investigate the ptu (on the passenger side timing belt cover there are 2 versions the old version is known for failing and knocking out a few cylinders's/PTU%20Repair.pdf

rough idle could be caused by vacuum leaks and or incorrect timing should be 15 degrees before tdc

Dec 13, 2009 | 1990 Nissan 300ZX

1 Answer

Ok i gotta 91 TT and i replaced the ignition coil connectors and the ignotion coils themselfs, now its seems as two of my ignition coils wont get power to them to create a spark on my sparkplug (of...

ptu (power transistor unit)'s/PTU%20Repair.pdf

the series 1 ptu goes out really often. you can repair it or buy a new one.

had the same problem with mine replaced the ptu and worked like new.

the ptu is on the passenger side timing cover with two connectors going to it.

Jun 30, 2009 | 1991 Nissan 300ZX

1 Answer

My 94 300zx tt wont start changed ecu cas and ptu

check timing, see if belt may have slipped out of timing, and need pressure tester to test pressure where the fuel goes into the fuel filter. check for vaccuum leaks.

Feb 16, 2009 | 1990 Nissan 300ZX

2 Answers

Car not starting

check the mass air flow sensor

Jan 25, 2009 | 1986 Nissan 300ZX

1 Answer

CAS Input Shaft in Nissan '92

Its a sensor for timing on the cam ends.

Nov 17, 2008 | 1992 Nissan 300ZX

2 Answers

No spark

Check the power transistor unit (the small black box on the front of the engine, passenger side, slightly beneath the main black intake hose coming to the intake manifold). It has six or seven wires coming in one side and out the other. That part was the one warranty recall for the Z from 90-96. I'm not sure what year yours is since the question is listed as a generic 300ZX question, but the recall affected 1990 models and a few early 91s. The PTU was redesigned with a heat sink to keep it from overheating (the main reason determined to cause the failure). This is the unit that drives the signal to the coil packs to fire the plugs. If it dies, you'll have no spark and the car won't run unless it decides to revive itself or you change it. If that doesn't fix the problem, I'd look into the CAS (metal circular sensor, front of the engine, driver's side, one harness plugged into the side) - that is the cam angle sensor and can cause you to lose ignition as well.

Jul 28, 2008 | 1990 Nissan 300ZX

2 Answers

Won't start

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 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.

Jul 02, 2008 | 1993 Nissan 300ZX

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