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Ask sprinkles08 Your Own Question
sprinkles08, ASE Certified Technician
Category: Chrysler
Satisfied Customers: 22801
Experience:  ASE Master & Advanced level certified, Chrysler Master Certified, Trans and Hybrid Specialist
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Chrysler PT Cruiser: I have a 06 pt cruzer that intermittently

Customer Question

I have a 06 pt cruzer that intermittently fails to start. engine turns but it wnt catch. after it sits a while it starts and runs great. any thoughts?
Submitted: 2 years ago.
Category: Chrysler
Expert:  sprinkles08 replied 2 years ago.
Hello and welcome to JustAnswer!
There are quite a few things that can cause a no start condition ranging from the fuel pump, ASD relay, lost cam or crank sensor signal, wiring issues, or even the powertrain control module itself.
If the problem happens only on a hot restart the most likely cause would be vapor lock due to a weak fuel pump check valve.
The first thing that shoudl be done is check for fault codes. If it's losing spark then there will almost surely be a code set that can be used as a starting point for diagnosis.
If there are no codes set then testing will need to be done while it's acting up to determine if it's missing spark or fuel and then diagnose the appropriate system.
Customer: replied 2 years ago.
I found no codes. the issue is not confined to a warm start condition. I scanned the codes with no result, it has been my experience that relay's, lost cam or crank sensor signal issues are fault no fault and not intermittent. I have seen fuel pumps fail when the tank is low on fuel I assume due to a weak diaphragm; however this is not the case in this instance as the car shows no "pop" at all. I am convinced that it is a ignition issue. I am beginning to suspect a possible issue with the alarm system. I am assuming that there is a disable function. I am also wondering about the existence of a security chip in the key fob? would a low battery in the fob possibly be the culprit?
Expert:  sprinkles08 replied 2 years ago.
You've physically confirmed that there is no spark?
Customer: replied 2 years ago.
no I have not as the problem is intermittent and I have not had equipment with me. My thoughts are that there would be enough pressure in the fuel rail to at least give me a cough. unless the pump had failed completely, and then it would not run at all. I am working with limited knowledge here. All this computer stuff if past my pay grade.
Expert:  sprinkles08 replied 2 years ago.
The first thing you're going to need to do is confirm whether it's spark or fuel that you're missing.
Customer: replied 2 years ago.
I have confirmed that it is a spark failure.
Expert:  sprinkles08 replied 2 years ago.
Do you have a scan tool?
Customer: replied 2 years ago.
yup already scanned it. no codes stored or pending.
Expert:  sprinkles08 replied 2 years ago.
Are the cam and crank signals present while cranking?
What is cam/crank sync degrees while cranking?
Does it show ASD relay on while cranking?
Customer: replied 2 years ago.
I will check it and get back with you.
Expert:  sprinkles08 replied 2 years ago.