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Discussion Starter · #1 ·
Hello everyone.
I recently purchased a 2010 nitro 3.7. When i drive it for about 4 miles, run in to the store, and come back out and go to start it,it sounds like it has only 3 cylinders firing with no response when give it gas. Turn it off and start it again it runs fine with no sputter. It only does it when its warm. No codes are coming up.
 

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First off, welcome to the forum. When you get a chance, head on over to the "Newbie Forum", so that we can give you a proper welcoming.

I would be looking at the condition of the spark plugs and making sure they are in good shape. You do not mention how many miles your vehicle has but this could be an issue. Only use OEM plugs as the 3.7L engine is very finicky.
 

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The plugs in the 3.7L should be changed every 30,000 miles or so. Therefore, your could be due for a swap. It is a cheap and easy place to start if nothing else.
Just stick with the stock copper plugs as the 3.7 does not like platinum or other types of plugs.
 

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Discussion Starter · #5 ·
But if it was the plugs wouldn't it do it all the time. This is very intermittent. I just took it to the place where i bought it they scanned it and could not find anything wrong. But if course it didn't do it.
 

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They can only pull codes if the CEL is on. Being that your plugs are overdue for replacement i would say there is a good chance they are loosing performance. They are not totally dead so thats why they could only cause a problem periodically.j
 

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07Lifted,4X4,6sp-man,3.7L
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The cranks sensor could be a possibility. But first things first, check the plugs. Then go from there.
 

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07Lifted,4X4,6sp-man,3.7L
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Good deal. :smileup:
Probably wouldn't hurt to run a can of seafoam in the fuel tank to clean the injectors after a while. I would not do it right away just because the seafoam does make it run a little rough till its worked through the system. When you decide to do it, also run a little into the brake booster vacuum line, to clean the intake.
 

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What did the plugs look like? Check the right side cam timing sensor. Check the wiring. It's also a good idea to remove it and clean it. Over time, metal sticks to the tip. Gunk buildup will also hurt it. When enough metal sticks to it, reading may throw off timing.
 

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07Lifted,4X4,6sp-man,3.7L
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Could be a leaky injector or check valve in the fuel pump. Is the gas cap seal in good condition?
Try turning the key to the "on" position but do not try to start it. Turn the key off, then back to "on", listen for the fuel pump to run and shut off. Then try to start it.
If it were a heat soaked sensor, in theory, it should be worse after a long drive not a short one.
How is the operating temp when you shut it down?

See post 11 above also.
 

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Discussion Starter · #14 ·
The fuel pump does run and shut off everytime but i did that when its cold I can also hear two clicks when the pump is running. When it did it today it was after running it for a while Then shut it off then came back out and it did the sputtering on start up. This happend again when i got home and did the same thing.
 

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Discussion Starter · #15 ·
The fuel pump does run and shut off everytime but i did that when its cold I can also hear two clicks when the pump is running. When it did it today it was after running it for a while Then shut it off then came back out and it did the sputtering on start up. This happend again when i got home and did the same thing.
The temp was at the normal running temp when it was on and when i came back out.
 

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The fuel pump does run and shut off everytime but i did that when its cold I can also hear two clicks when the pump is running. When it did it today it was after running it for a while Then shut it off then came back out and it did the sputtering on start up. This happend again when i got home and did the same thing.
Not sure I understand what you are saying. You did a key "on" not trying to start it, then key off cycle, before trying to start it?
Hum, :thk: I was thinking maybe it was not at full operating temp, causing it to enrich the fuel mixture like on a cold start. Essentially choking it out.
 
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Connect a fuel pressure guage. Knowing fuel pressure is a big help. You can borrow a gauge from a parts store. I just bought a set from Harbor Freight. Having tools like compression and fuel testers have saved me a ton of trips to parts stores.
 

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Discussion Starter · #18 ·
Yes i did the cycle to see if the fuel pump is running and it is but when the fuel pump runns i can hear 2 clicks toward the rnd before it shuts off. I will check the fuel pressure on wed. What is the fuel pressure suspose to be at ?
 

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Gasoline fuel pressure should be 58 psi +/- 5 psi.
 
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