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Cylinders 1,2 3 arent firing. 98. Replaced map and cps

Customer Question
Cylinders 1,2 3 arent...

Cylinders 1,2 3 arent firing

Mechanic's Assistant: What is the model/year of your Jeep?

98

Mechanic's Assistant: Are you fixing your 98 yourself? What have you tried so far?

Replaced map and cps sensors

Mechanic's Assistant: Which particular sensor are you asking about? And have any trouble codes been triggered?

The first code was for the coolant sensor, then had a leanfuel cose

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Not that i can think of

Submitted: 4 months ago.Category: Jeep
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Answered in 1 hour by:
3/26/2018
Jeep Mechanic: Amedee, Jeep Technician replied 4 months ago
Amedee
Amedee, Jeep Technician
Category: Jeep
Satisfied Customers: 28,335
Experience: ASE certified Technician advanced level specialist. Wisconsin certified emissions state inspector
Verified

Hello and welcome!

My name isCustomerand I can assist you with your question.

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Jeep Mechanic: Amedee, Jeep Technician replied 4 months ago

May I start by getting your VIN and any codes stored in the computer?

Thank you!

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Customer reply replied 4 months ago
I had all the codes cleared, I had one for the coolant sensor and one that said it had Aleah fuel condition
Jeep Mechanic: Amedee, Jeep Technician replied 4 months ago

Thank you. I need to know the year, make and model vehicle please.

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Customer reply replied 4 months ago
98 Jeep Cherokee
Jeep Mechanic: Amedee, Jeep Technician replied 4 months ago

And the engine size please

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Customer reply replied 4 months ago
4.0
Jeep Mechanic: Amedee, Jeep Technician replied 4 months ago

Thank you for that information.

How do you know cylinders 1,2 and 3 are not firing?

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Customer reply replied 4 months ago
I can pull off the injector wires and the engine has no change in the idle, was wondering what is common between the three
Jeep Mechanic: Amedee, Jeep Technician replied 4 months ago

Got it! Thank you for that information. You will need to check for spark, fuel and compression on those three cylinders. Also, check engine vacuum with the engine at idle.

Let me know!

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