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Discussion Starter · #1 ·
Hi, I have a trajet 2003 auto petrol, and this week's fault is it keeps cutting out on me. Sometimes it will start straight away and I'm off up the road quite happily, but sometimes the starter will spin and spin, if I leave it a bit, it will normally start again. Help pretty please peeps it's summer holidays and I don't wanna buy another car ?
 

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You need to find out if it's losing fuel or ignition. Do you have any tools? Fuel pressure tester?
When you say the starter spins and spins...is the engine turning over and just not starting?
 

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Discussion Starter · #3 ·
You need to find out if it's losing fuel or ignition. Do you have any tools? Fuel pressure tester?
When you say the starter spins and spins...is the engine turning over and just not starting?
No tools sorry, it runs quite happily most of time, this is a new problem. Yes the engine is turning over. Thanks
 

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There are many things in the ignition system that can be intermittent.

Does that have a schrader valve in the fuel line? If so, take the cap off and press the valve (protect yourself) and it should shoot out fuel. If not, it may be the fuel pump relay. Common problem and a cheap easy fix.
 

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When it doesn't want to start ...

If you can then check the spark when it doesn't want to start
Have a friend crank the engine and feel the injectors
Sometimes one can feel if they are firing (noid light would be better or even a digital multi-meter)
If both are out then it could be crankshaft sensor

If spark is good and feel injector pulse then would check fuel pressure
See if there is a Schrader valve on the fuel line
Depressing it should show whether there is pressure on the line
If you can (in a quiet setting) turn the key to the "ON" position and listen for the fuel pump priming
 

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You can use a screwdriver to hear the injectors. Use it like a stethoscope with your ear against the plastic end with other end on the injector. You'll here it click.
If you have no spark or injector it's probably the ICM.
 

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You can use a screwdriver to hear the injectors. Use it like a stethoscope with your ear against the plastic end with other end on the injector. You'll here it click.
If you have no spark or injector it's probably the ICM.
Before changing the Ignition Control Module (ICM), should a test or two be done?
Like knowing theory that there is a wire going from the ICM to the ECU.
The crankshaft sensor produces a signal to the ICM.
The ICM changes it to a digital square wave (0 to 5 volts)
and send it to the ECU on that wire.
The ECU sends back a signal to the ICM to fire the spark plugs
The ECU sends another signal to the injectors to fire
A proper test is necessary before changing parts
 

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Before changing the Ignition Control Module (ICM), should a test or two be done?
Like knowing theory that there is a wire going from the ICM to the ECU.
The crankshaft sensor produces a signal to the ICM.
The ICM changes it to a digital square wave (0 to 5 volts)
and send it to the ECU on that wire.
The ECU sends back a signal to the ICM to fire the spark plugs
The ECU sends another signal to the injectors to fire
A proper test is necessary before changing parts

Absolutely, I use a scope to check the CKS to the ICM to make sure the CKS is not the problem. If the crank signal is good I check the B+ and grounds at the ICM. If they are good and the ICM has bad output the ICM is bad.



I didn't tell him to condemn the ICM but that is was PROBABLY the ICM. More likely that than the crank sensor.
These rudimentary tests we give him only point to areas of possible problems. I don't think most people on here have a scope or would even know how to use one. General direction is all we can give.
 

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I didn't tell him to condemn the ICM but that is was PROBABLY the ICM. More likely that than the crank sensor.
These rudimentary tests we give him only point to areas of possible problems. I don't think most people on here have a scope or would even know how to use one. General direction is all we can give.

When you say, "
If you have no spark or injector it's probably the ICM.
People on here just jump to conclusion
And then go to replace parts
and if it don't work out then you get the blame
I am just pointing out to be a little cautious
 

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When you say, "
People on here just jump to conclusion
And then go to replace parts
and if it don't work out then you get the blame
I am just pointing out to be a little cautious

I don't tell anyone to just replace any item I may mention. If they do that's on them.
Why do you care? You mention the CKS.....aren't you doing what you tell me to be cautious about?
 

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I don't tell anyone to just replace any item I may mention. If they do that's on them.
Why do you care? You mention the CKS.....aren't you doing what you tell me to be cautious about?
I usually mention to test further
But, what I said prior leads to the test for the crank position sensor
No injector pulse and no spark

Yeah, no one says it directly but what happens ...??
 

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I usually mention to test further
But, what I said prior leads to the test for the crank position sensor
No injector pulse and no spark

Yeah, no one says it directly but what happens ...??

I'm done arguing with you. I will expose your incompetence when you are giving people bad information. If you don't want to be corrected make sure you know what you are talking about.
 

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I'm done arguing with you. I will expose your incompetence when you are giving people bad information. If you don't want to be corrected make sure you know what you are talking about.
Sure, be that way.
And I will do the same ... just because you think you know it all.
 

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Absolutely, I use a scope to check the CKS to the ICM to make sure the CKS is not the problem. If the crank signal is good I check the B+ and grounds at the ICM. If they are good and the ICM has bad output the ICM is bad.
I have seen a bad signal from the ICM.
It was replaced twice.
It wasn't the ICM.
Could tap it (to reproduce the signal) with a 12 volt supply and the injectors would fire.
But, it wasn't the ICM that was bad
What it turned out to be was a partial short to ground on that wire
So, it is possible to have something happen that you aren't aware of.

You can be absolutely sure of your facts
But, not everything will always line up
Sure, you'll probably be right most of the time
But, you don't know everything
 

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What's this avisitor? Someone trying to take my job? :laugh:

BTW, I think I can completely rule out an ICM fault since Hyundai engines don't have one.
 

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What's this avisitor? Someone trying to take my job? :laugh:

BTW, I think I can completely rule out an ICM fault since Hyundai engines don't have one.

You are right. The CKS is processed by the PCM and there is no ICM. I forget what vehicles use what modules. Probably because I worked the desk most of the time the last 10 years before retiring in March. I didn't work the L1 side more than 5 hours, 10 at most in a week. I let my certs expire 6 or 7 years ago as well.
 

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What's this avisitor? Someone trying to take my job? :laugh:

BTW, I think I can completely rule out an ICM fault since Hyundai engines don't have one.
Sorry, no. This guy is just rude and insulting.
Thinks he knows it all.
Granted that he has some knowledge
But, he has more excuses
Oh, that is right, he has forgotten more than I know
And he doesn't work on cars anymore
He does the front desk for the last ten years
Also seems he has forgotten how to read
He mis-read my posts and then calls me an idiot

You have never resorted to name calling
I haven't resorted to name calling
Guess if I met this guy at the desk of a garage then I would walk away
He doesn't know how to talk to people
 
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