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Peter Bagley
Peter Bagley, Toyota mastertech
Category: Lexus
Satisfied Customers: 617
Experience:  master tech at Toyota dealer
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1993 sc300 intermittent crank no start. Always starts first

Customer Question

1993 sc300 intermittent crank no start. Always starts first thing in the am but will crank no start when it I warmed up. Let it sit for an hour and it almost always starts. Also, when trying to get it to turn over it catches for a couple of seconds and then the idle drops out. once started it drives great. Stays running with a perfect idle, ie no hunting or other idle issues.
JA: How many miles are on the car? What size is the engine?
Customer: 157000k 3 liters
JA: What is the model of your '93 Lexus?
Customer: 1993 sc300
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: Replaced the air mass meter, check connection is various places
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 4 months ago.
Category: Lexus
Expert:  Chad Farhat replied 4 months ago.

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

Customer: replied 4 months ago.
Thanks
Expert:  Chad Farhat replied 4 months ago.

hey how are you

1- we need fuel & spark to start ,so what you missing when it want start ,fuel spark or both?

2- The most common issue on these are The CKP sesnor with interminet no starts

3- fuel pressure needs checking :these are your specs

1993 Lexus SC 300 L6-3.0L (2JZ-GE)

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Fuel Pump Pressure No vacuum to regulator ........................ 38 - 44 psi (265 - 304 kPa) With vacuum to regulator ...................... 33 - 37 psi (226 - 265 kPa)

4- are the ignition coil firings

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

Customer: replied 4 months ago.
No thanks. Lets type for
What is a ckp sensor
Customer: replied 4 months ago.
is that a crank position sensor
Expert:  Chad Farhat replied 4 months ago.

Crank Shaft position Sensor

Ignore the phone call request ,not me sending it , the system does it :)

no call necessary here

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

Expert:  Chad Farhat replied 4 months ago.

yes if the ckp not sending the signal to the ecm then coils want fire

Customer: replied 4 months ago.
Thanks Chad. I will give it a try. How do I let you know the results
Expert:  Chad Farhat replied 4 months ago.

1993 Lexus SC 300 L6-3.0L (2JZ-GE)

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NOTE: The cam position and engine speed sensors are not serviceable. If found defective, the distributor must be replaced.

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Ignition Wire Removal

Removal
- Disconnect ignition wires from cap.
- Disconnect distributor electrical connector.

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Setting No. 1 TDC

- Remove oil fill cap.
- Looking through fill hole, rotate engine until cam lobe points upward.

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Setting No. 1 TDC

- Turn crankshaft counterclockwise approximately 120°.
- Bring crankshaft back clockwise until the crank pulley timing mark aligns with the TDC mark on the cover.

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Distributor Hold-down Nut

- Remove hold-down nut and remove distributor from head.

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Distributor Alignment

Installation
- Install new o-ring on distributor shaft.
- Align groove on distributor housing with mark on drive gear.

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Distributor Removal

- Install distributor with stud centered in the adjustment flange.
- Lightly tighten hold-down nut.
- Connect ignition wires and distributor electrical connector.
- Start engine and warm to normal operating temperature.
- Set ignition base timing. Refer to ADJUSTMENT PROCEDURES.

Expert:  Chad Farhat replied 4 months ago.

Happy Holidays

Please let me know if you need anything else on it, just reply back and we will continue

If you are good, Please Kindly Rate Me.

A 5 Star Rating is much Appreciated

If you feel I have not been helpful Please DO NOT RATE ME BAD OR POOR (1 or 2 stars) ,You can always ask me again or I can opt out of your question & open it for another expert ,that will provide you with more or better assistance on this issue

Please keep in mind that when you rate me , it does not end our conversation.

you can always come back to this conversation and ask me any follow up question you may have on this issue

(you can copy this link page & paste it in your browser when ready and it will open up our conversation again)

Thank You
Chad Farhat
ASE Certified Technician

Customer: replied 4 months ago.
Followed all the recommended procedures including replacing the distributor but we still have intermittent crank no start.
Customer: replied 4 months ago.
Please offer other possibities. Need to get to the bottom of this ASAP
Expert:  Chad Farhat replied 4 months ago.

I m not sure on this ,that is as much as i know on it

I will opt out of your question and open it for other experts to assist you

Just don't reply back to me since it will lock the question back to me and other experts don't see it

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

Expert:  Peter Bagley replied 4 months ago.

Hello , my name is ***** ***** master tech here to help. I read your notes and have a question to verify exactly what your problem is. It starts fine in the morning and after it sits for a while but not very well when warmed up or hot is that correct?

Customer: replied 4 months ago.
It always starts up fine when stone cold. Cranks no start after warmed up. Will hold idle for a second or two but then stalls. After many attempts it will hold idle and run fine as if there is no problem. Performance is fine when driving. Never stalls once it stays started

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