Car has no go - low engine power output?

Tiny
CHRIS372
  • MEMBER
  • 2 POSTS
  • 1998 CHEVROLET IMPALA
  • 94,738 MILES
While driving my car the check engin light came on and it started to skip and acted like it had no power. When motor is at around 4000 rmp you can hear a ratteling in the motor. Could it be the timing chain needs replaced?
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Thursday, September 17th, 2020 AT 11:51 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,388 POSTS
Before we do anything with the timing, have you scanned the computer to see what trouble code is stored in it? It could be a bad coil, plug. (Something simple)
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Thursday, September 17th, 2020 AT 11:51 AM (Merged)
Tiny
CHRIS372
  • MEMBER
  • 2 POSTS
No I have not scanned computer
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Thursday, September 17th, 2020 AT 11:51 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,388 POSTS
I recommend starting there. If the check engine light was on, it should give us an idea as to where the problem was coming from. Most parts stores will scan it for free. Have that done and let me know what you find.

Joe
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Thursday, September 17th, 2020 AT 11:51 AM (Merged)
Tiny
ORANSKI
  • MEMBER
  • 2 POSTS
  • 1995 CHEVROLET IMPALA
My 1995 impala ss has no power while cold and as soon as it warms up it will stalls and will not start until engine is cold. I have no codes. Any help would be appreciated.
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Thursday, September 17th, 2020 AT 11:51 AM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Possibly the ignition system, those engines have a distributor behind the water pump, its driven by the cam. If youve ever had a coolant leak above it it could have shorting issues. They also had bearing problems
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Thursday, September 17th, 2020 AT 11:51 AM (Merged)
Tiny
ORANSKI
  • MEMBER
  • 2 POSTS
I was thinking it might be a cam sensor. I have to take the same parts off to get to the distributor or the cam sensor. I probably will replace both parts when I do. Thanks for the reply.
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Thursday, September 17th, 2020 AT 11:51 AM (Merged)
Tiny
MATT PEAY
  • MEMBER
  • 1 POST
  • 1964 CHEVROLET IMPALA
  • 5.3L
  • V8
  • 2WD
  • MANUAL
  • 32,331 MILES
Drive 5-8 miles then it starts losing power like it’s hitting on 6 cylinders or starving for fuel not for sure which. Sometimes I let off on gas and it gets better. Sometimes I have to shift down to keep it running as well. Changed wires, plugs, fuel filter, distributor cap rotor pick up everything but carburetor! Please help sure would like to take to car shows.
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Thursday, September 17th, 2020 AT 11:51 AM (Merged)
Tiny
94 TRANSAM
  • MECHANIC
  • 680 POSTS
Hi Matt, welcome to 2CarPros.

It sounds like maybe your ignition coil is going bad and as it heats up its building up internal resistance and the spark gets weak. Here is a guide on how to test a coil. It is a modern coil not a can style but you test them the same way.

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Let me know what you find or if you need help doing it.

Rich
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Thursday, September 17th, 2020 AT 11:51 AM (Merged)
Tiny
B1THOMAS
  • MEMBER
  • 1 POST
  • CHEVROLET IMPALA
My vehicle is a 2000 Chevy Impala LS 3800 V6 with 84,000 miles. It is an automatic transmission. Here is the problem: while I am accelerating, the vehicle often begins to buck for several seconds until I have reached a speed 5 10 mph higher then where it began. If I look at the RPMs during the bucking, the needle will be bouncing up and down. The idle of the vehicle appears normal. What is the problem?

The only other problem with the vehicle I know of is a poor ignition wire set that may need replacing. Could that cause the problem? I talked to a repair shop and the individual told me to wait until a light came on because they would be unable to find anything at this time. I am worried that if I wait until a light comes or until the problem worsens, I will have damaged other areas of the vehicle. What are your suggestions?

THANK YOU
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Thursday, September 17th, 2020 AT 11:52 AM (Merged)
Tiny
SUMDUDE
  • MEMBER
  • 2 POSTS
Honestly when the impalas are slow to accelerate, bad gas milage its the Catylic COnvertor gone bad or cogged up. Take it to the dealership. Cehvy extended the milage to 8 years or 120, 00 mile si believe. Ask them to do a back pressure test on the Cat convertor.
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Thursday, September 17th, 2020 AT 11:52 AM (Merged)

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