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Hello,

I'm pretty new here, helping a friend with their 2007 Compass 2.4 w/ just over 100k miles.

The truck has been hesitating lately. It feels like a slight hiccup in acceleration. Also, it occasionally hunts for idle, usually starting around 1,110RPM, an settling down to ~600RPM after about a minute.

We started with a simple tune-up. Spark plugs and the pre-cat o2 sensor, but this didn't alleviate the issue.

Does anyone have any experience with these symptoms? I'm currently leaning towards a dying fuel pump, or possibly a vacuum leak.

Could someone point me towards a vacuum diagram or a service manual for this vehicle?

Thanks!
 

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I had the same problem but I would notice it when it would downshift, so I changed the automatic transmission fluid and its filter and didn't notice it again. But a couple weeks later it started up again so I changed the spark plugs and after two days of driving I haven't noticed it, but if it does it again I'm changing the fuel pump.
 

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same problem here.. and I'm at 98 000km lol I think I should do a good check of the engine before I hit the 100 000
 

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Mine was doing the same thing, I did have the fuel pump replaced after one day the car just wouldn't start... I had it replaced yesterday and tonight same problem and it won't start...We had the hiccups in acceleration and we also had occasional rough start ups. Car seemed fine all last night and today and to be honest I am pissed at this point.
 

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same year model jeep as OP, 2007 2.4L 4x4... same hesitation. started at 150k miles. the car will buck with moderate acceleration about 4-5 times before reaching top speed.

This car was bought used and has not been maintained. We replaced the fluid in the CVT and spark plugs are getting replaced tomorrow.

anyone ever figure out what was causing the hesitation during acceleration??
 

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First thing is check for CODES. There are so many things that might cause that other than a basic tune-up if not previously done. EG Plugs (copper and not platinum types), good gas, air filter, throttle body cleaning. Although the oil has no effect on this but if regular oil changes have not be done it may aggravate the condition of the engine and/or be sludged up now.

If there aren't any codes and the tune-up is done. Checking the fuel pressure may be the next step. If the pressure is dropping below spec's the engine will not perform properly under various circumstances. Pulling the tank could be a challenge though as I was told when the dealer replace mine under warranty. This are not built for easy servicing.
 

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Tripplec thanks for the advice - I rebuild old land cruisers so this computer car world is new to me. Will the car give codes without an engine light?

No hesitation after some maintenance today. The engine was 1.5 quarts of oil low and the spark plugs were pretty bad. Platinum, gaps ranging from .030 to .055. I replaced them with copper and gapped them to .040

I also used my ohm meter on the coils. They are all 0.8 ohms. Couldn't find a factory spec but it matched the reading I got from a brand new coil at autozone
 

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For codes you need an ODBC reader EG Scangauge ( ScanGauge - Trip Computer + Digitial Gauges + ScanTools) or other type many auto parts stores sell. Autozone may do the readings as a service with their unit. Just ask them. In Canada I don't anyone who does so I have my own unit.

1.5 quarts low, you're bad, oh Really Bad BAD. Poor engine must be grinding its balls, oh I mean bearings. LOL

That's the way to end up broken down in knowhere on day neglecting it like that.
 

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you didn't answer my question:

will the computer give codes without an engine light?

EDIT: google tells me no. This car was having the problems with no engine light. You can't pull codes without an engine light.

thanks for the lecture on oil levels though. I thought engines could run without it.
 

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you didn't answer my question:

will the computer give codes without an engine light?

EDIT: google tells me no. This car was having the problems with no engine light. You can't pull codes without an engine light.

thanks for the lecture on oil levels though. I thought engines could run without it.
The ODBC reader can retrieve codes whether the engine light is on or not. That light comes on for a specific group of faults mostly emissions related.
 
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