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Old 04-16-2011, 06:43 AM   #1
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Tj Cranks but won`t start (in Norway :)

Hi my name is Kristian and i am from Norway
I have a Jeep Wrangler 97 2.5l Gasoline

When driving home from work it started to act like crazy ,jumping and dropping in rpms until it died. It startde right up but did the same and died. It did so about 4-5 times until it woulden`t start anymore
Previously when driving on the high way it would do the same, die but then start right up, like lack of spark or empty on fuel.

My mechanic has now had it for 6 weeks, told me it was the ECM. I did not belive that because my old was only 6 months old, and the symtomps diden`t add upp. Anyway i swapt it for a "new " one, still no luck.

Her is what i know so far :
No power to coil .
PCM Black connector, when disconected , i get power (5 v) to coil.
When put back in , nothing.
Cav 17 on connector measures likes it`s grounded constant ( mechanic told me ) ?
Switch plate brand new
CPS 5 months old but might be of poor quality
O2 sensors fault codes reported lean mixture so now it gets to much fuel


Any help is much appreciated


Kristian

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Old 04-16-2011, 08:41 AM   #2
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Kristian, that problem is often caused by either the crankshaft position sensor or the camshaft position sensor. I doubt it's the PCM (also known as the ECM).

The coil normally gets constant power and is pulse-grounded by the PCM to produce spark. The PCM will only start pulse-grounding the ignition coil when it gets all the inputs and timing signals (like from the two CPS devices) that it needs before it will provide spark and fuel to the engine.

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Old 04-16-2011, 10:49 AM   #3
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My opinion also.
And i talked to the mechanic, and he said that all sensors looked good.
How can i verifi the CrankPS?
And what will the symptoms be if it failed?

Camshaft sensor is brand new made by STANDARD, i belive this is ok(Or?)

CPS i don`t trust, when i got it i woulden`t fit in connector so i made som smal adjustments to make i fit .
But worked for about 5 months


Thank you for your answer
Kristian
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Old 04-16-2011, 10:58 AM   #4
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Early '97 TJs had different electrical connectors that were right out of the '95 YJ Wrangler, that's undoubtedly why the connector was different. If you specified a CPS for a '97 TJ and it didn't fit, you'll probably have better luck in the future asking for one for the '95 YJ Wrangler. I had the same issue with my TPS (throttle position sensor) in my very early (manufactured 3/96) '97 TJ.
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Old 04-16-2011, 12:17 PM   #5
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The connector looked the same until you put them against each other (male connector to male) then you could see the (very) smal difference.
iIt looked a little bit off... like from a bad cast to make the connector.

Thats why i belive the CPS is of bad quality.

What about the verification and symptoms of the CPS?

Thanks for your help and bear with me on my language and spelling errors
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Old 04-16-2011, 01:24 PM   #6
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Had the exact same problem with my yj so this may not apply but it ended up being a loose vacuum hose. 10 yrs ago so I can't remember where it was connected. It was also an i4.
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Old 04-16-2011, 02:24 PM   #7
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Quote:
Originally Posted by Redcrown View Post
The connector looked the same until you put them against each other (male connector to male) then you could see the (very) smal difference.
iIt looked a little bit off... like from a bad cast to make the connector.

Thats why i belive the CPS is of bad quality.

What about the verification and symptoms of the CPS?

Thanks for your help and bear with me on my language and spelling errors
Your English, grammar, and spelling is superior to many native-born Americans so no worries there.

The symptoms of a bad CPS can be identical to your problem but there's no guarantee (of course) that the problem is indeed being caused by the CPS. But it certainly could be. Check for a loose or disconnected vacuum hose too as suggested above.
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Old 04-16-2011, 02:25 PM   #8
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I`ll put that on my troubleshooting list as well, you never know
Thanks


Of topic:
I am going to New York and Miami this summer, can anybody recommend som candystores for Jeep enthusiast .

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