Question about 2004 Chevrolet Silverado 1500 Crew Cab

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Hesitation when engine is cold it hesitates in 1and 2 gear.

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Information is needed on the Temperature and Humidity conditions in order to determine if this is an Icing problem in the Air Induction system from fresh air intake up to and including the throttle body. It seems that this condition is apparent only within the first half mile or less immediately after start up on my truck. This is considered relatively normal in Michigan where I live. Perhaps it is also a condition most noticeable only in the Spring or Fall when Gasoline is formulated differently. In Spring Winter formula Gasoline contains "Light Ends" to aid Cold Starting. In Fall the Gasoline is sometimes not formulated to coincide with the lower mean average temperature in your geographic area.

Many other things can influence this condition. Having a Clean Air Filter, good Spark Plugs as recommended by the manufacturer. Another often over looked item is the Fuel Filter. One more item which is very expensive is a partially clogged Catalytic Converter which causes excessive Back Pressure and also reduces performance noticeably. Even the Mass Airflow Sensor can be too cold. It is electrically Heated but takes a couple of minutes to warm up. As you can see, there are many possibilities which can affect "Cold Start Drive away". I have attempted to enlighten you in what to look for then check out the components and/or conditions apparent when this occurs.

Fastest Robert

Posted on Oct 04, 2008

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Have a 1994 Jeep Cherokee Laredo it is hesitating on acceleration .there is an oxygen sensor broken and now it isn't kicking into overdrive, as it did before, I went over vacuum problems.


which engine, 4.0L in line 6, one of 5 million>? opted.
replace the 02, always fix first what you SEE is broken.
hesitation has many causes, over 50.
I;ll not guess the 50
but tell you , we use simple tools to do tests. 1 to 10 tests.
and cause is revealed. (pure physics)
ok (kicking) so it has an automatic trans, and if engine is limphome mode or transmission same, then this is normal,
normal for hard failures...
check fuses, yet?
scan it yet? opps that be first... for sure.
or if all this is confusing?, get car serviced?

(hesitation) not guessing, just common, causes.
1: engine vacuum is bouncing, (bad engine)
2: a bad TPS.
3: it's not vacuum leaks because jeeps make extra power with leaks. (facts of speed density systems) (MAP based engine)
4: never tuned up this decade.
5: engine is misfiring for any reason.
6: engine bogging, low fuel pressure.
7: bad gas.
8: ASD relay dropping out and back in fast? scan it.
9: bad 02 sensor. oops.. may cause rich misfire...

best? (cars are complex as are engine and trans controls)
post all symptoms , good or bad.
what works and not. ?
parked, idling and driving?
cold engine and hot.? both fail?
engine power loss?
misfires?
engine bogs or hesitates.?
trans shifts wrong (say exactly what gear)?
noises. odd.?
if you ever had a full tuneup this decade.?
like that, your mech sees all this in 15min work
we can't.

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RPM of engine tells you that.
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