Engine Hesitation?

Tiny
WAYNESRAGE
  • MEMBER
  • 1999 CHEVROLET SILVERADO
  • 4.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 110,000 MILES
Trucks starts up fine at times, this morning it did not. It will Idle good and then when it goes into gear and give it a little gas it will try to bog down and after around fifteen seconds of it it clears up and everything is fine.
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Sunday, June 10th, 2018 AT 6:14 AM

48 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi and thanks for using 2CarPros.com.

This could be several things. If the check engine light is on, have the computer scanned to determine trouble codes and possible solutions to this problem.

If there is no check engine light, I would start by checking fuel pump pressure. If the pressure is low at first, it can cause the symptoms you described.

Here are general directions for checking fuel pump pressure:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

and

https://www.2carpros.com/articles/engine-hesitates

The pressure specifications are:
Engine NOT running 60 - 66 psi at 0 rpm
Note: Check pressure with the key "on" and the engine not running.

Do this and let me know what you find.

Take care,
Joe
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Sunday, June 10th, 2018 AT 8:54 PM
Tiny
ANDREW0408
  • MEMBER
  • 1999 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 132,000 MILES
I am trying to figure out why my truck is hesitating. When I first start off the RPM's will climb until it shifts from first gear to second gear and then it does it again from second to third but just not as bad. I have replaced the fuel filter but it did not solve the problem. What do you think is causing this?
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Thursday, September 3rd, 2020 AT 11:38 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
Have you checked for vacuum leaks? Has the check engine light come on? Have you tested fuel pump pressure?

Let me know.

Joe
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Thursday, September 3rd, 2020 AT 11:38 AM (Merged)
Tiny
ANDREW0408
  • MEMBER
I havent checked for vaccuum leaks or the pump pressure yet
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Thursday, September 3rd, 2020 AT 11:38 AM (Merged)
Tiny
ANDREW0408
  • MEMBER
Yeah the check engine light has been on for a little while now
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Thursday, September 3rd, 2020 AT 11:38 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
IF the check engine light is on at times, there will be a trouble code stored in the computer. Take the vehicle to a nationally recognized parts store and have them scan the computer. Most will do it for free, so there is no money out of pocket for you. After they identify the code, you should know what the problem is. Let me know what you find so I can help you with further questions.

Joe
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Thursday, September 3rd, 2020 AT 11:38 AM (Merged)
Tiny
JARHEADS0331
  • MEMBER
  • 1998 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 164,000 MILES
My 98 chevy pickup started to have a awful mean hesitation upon acceleration and a surge upon decelleration first thing I thought of was ignition so here is what ive worked on, I was taught never to throw parts at the car however ive done as much diag time as I can the problem was before/remains after the following has been done
1. New ignition wires cap rotor and plugs
2. Fuel filter replacement
3. Checked maf sensor with voltage meter
4. SES light does not illuminate
5. The engine does not temporarly shut of just loses power when driving.
Replaced tps sensor and IAC valve performed sweep test no breaks
it continues to bang harder then originally had the problem and now also it stalls when shifted from drive to park. Any help would be highly appreicated.

Thanks, NIck
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Thursday, September 3rd, 2020 AT 11:39 AM (Merged)
Tiny
RASMATAZ
  • EXPERT
Thanks for the donation

The following could cause your problem:

Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires
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Thursday, September 3rd, 2020 AT 11:39 AM (Merged)
Tiny
CNOTE
  • MEMBER
  • 1998 CHEVROLET SILVERADO
  • V8
  • 2WD
  • MANUAL
  • 108,888 MILES
I was wondering if any one could help out with a 7.4 liter that stumbles at 1/2 throttle or so? Plugs and wires didn't help, nor did a tps. No check engine light. But it does idle a little rough. Please help
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Thursday, September 3rd, 2020 AT 11:39 AM (Merged)
Tiny
PEAR69
  • EXPERT
Did you use AC Delco plugs and wires? If not, change to AC Delco. Any other brand will not work and/or help. If there are no vaccume leaks and the PCV valve is not sticking, then it sounds like the the timing is off a little and the distributer gear may be worn. This is a commonly overlooked problem. You can take the distributer out to check or have the timing checked. Remember, the timing on your engine must be checked at operating temperature and with a scan tool -- a timing light will not work.

This guide can help.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down this guide and report back.
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Thursday, September 3rd, 2020 AT 11:39 AM (Merged)
Tiny
JRH1986
  • MEMBER
  • 1997 CHEVROLET SILVERADO
Hi I have a 1997 chevy c1500 with a 350 and automatic transmission 2wd I have issues with hesitation while accerlation when engine is cold when the engine is driven for a few miles the hesitation is gone and drives normal it only happens when the truck is first started and driven there is no check engine light on I replace spark plugs and wires on it and air filter if you know whats going on please help it driving me crazy about the hesitation while accerlating when engine is cold?
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Thursday, September 3rd, 2020 AT 11:39 AM (Merged)
Tiny
CARADIODOC
  • EXPERT
The place to start is by having the diagnostic fault codes read and recorded. The people at many auto parts stores will do that for you for free. The problem is though, a sensor reading has to go outside of a specific voltage range for a code to set. That sensor can sometimes report the wrong value but one that is acceptable to the Engine Computer. In that case your mechanic will have to look at live data on a scanner to see what doesn't look right.

Another thing to consider is a vacuum leak or a leak in the fresh air tube between the air filter box and the throttle body. Every manufacturer other than Chrysler uses a mass air flow sensor to measure the weight of the incoming air. A leak anywhere that lets air sneak in without being measured will result in no gas to go with it. That will cause a lean condition and typically a hesitation. Once the coolant temperature reaches a certain point, the system goes into "closed loop", meaning the computer adds the oxygen sensor readings to its list of things it uses to calculate fuel metering. That can result in the computer requesting extra fuel to get the lean mixture back to where it should be, and the hesitation will be gone.
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Thursday, September 3rd, 2020 AT 11:39 AM (Merged)
Tiny
TACOT
  • MEMBER
  • 1997 CHEVROLET SILVERADO
Engine Performance problem
1997 Chevy Silverado V8 Two Wheel Drive Automatic 135 000 miles

I have a 1997 Silverado with a 5.7L Vortec. Recently my engine has started to stumble and hesitate during acceleration. I have recently changed the spark plugs and fuel filter, cleaned the air filter and replaced my cap and rotor. Any suggestions?
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Thursday, September 3rd, 2020 AT 11:39 AM (Merged)
Tiny
SUPERSTAMPS
  • MEMBER
I had that problem. Then it was too late ( stuck in the middle of now where!) It was my fuel pump. Had it replaced and it runs like a dream. Hope that helps.
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Thursday, September 3rd, 2020 AT 11:39 AM (Merged)
Tiny
SPOOKMAN31@AOL.COM
  • MEMBER
  • 1996 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 18,500 MILES
My 96 chevy truck has a issuse when hot it stumbles when u accelarate, also hard start when cold. Replaced fuel pump and filter, ignition coil and module, replace map sensor, replaced cap, rotor, and plugs, replaced air filter, replced the spi unit under throttle body. Truck carries 60lbs of fuel pressure. Possible cat converter problem? Please if u can be helpful let me know. Thanks!
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Thursday, September 3rd, 2020 AT 11:39 AM (Merged)
Tiny
DOCFIXIT
  • EXPERT
Hi
Check engine light on? Could be two problems one stumble maybe MAF try cleaning. Cold start temp sender ECT near thermostat housing.
Let me know
Thanks for donate
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Thursday, September 3rd, 2020 AT 11:39 AM (Merged)
Tiny
SPOOKMAN31@AOL.COM
  • MEMBER
No codes present on truck. Was told by another mech possible cat converter plugged. Ck engine light has been taken out by some one else. Tech said their where no codes.
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Thursday, September 3rd, 2020 AT 11:39 AM (Merged)
Tiny
DOCFIXIT
  • EXPERT
Cloged CAT is not likely with your symptoms. What about MAF and temp sender?
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Thursday, September 3rd, 2020 AT 11:39 AM (Merged)
Tiny
DFRENCH87
  • MEMBER
  • 1995 CHEVROLET SILVERADO
  • 6 CYL
  • 2WD
  • MANUAL
  • 200,000 MILES
My 1500 Chevy Pickup started hesitating last week (as if it were running out of gas) and now has completely broke down. When I left it in Idle and then floored it- the truck made a groggling sound and it felt as if the fuel filter was clogged. I changed out the fuel filter, checked a couple of sparkplugs (they were loose, but still in good condition), and made sure the air filter wasn't damaged or clogged- no improvement. I haven't checked wires or anything of that nature, because Im kind of fed up. Do you guys have any insight on what the problem might be?
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Thursday, September 3rd, 2020 AT 11:40 AM (Merged)
Tiny
MASTERTECHTIM
  • EXPERT
Spray starter fluid into intake and if it starts then the fuel pump probably died.
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Thursday, September 3rd, 2020 AT 11:40 AM (Merged)

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