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Bogging down

Tiny
DANNYCAVE20
  • MEMBER
  • 1992 ISUZU RODEO
  • 6 CYL
  • 2WD
  • MANUAL
  • 125,000 MILES
My vehicle is bogging down from time to time. Sometimes the engine light will come on but if I turn the car off and back on it goes out and the car runs fine for awhile. When it starts to bog down usually I can floor the gas pedal and it will power through. When it starts acting up I can really smell the emissions and gas strong. I cannot run the AC compressor because turning it on makes the vehicle undriveable (major bog down). Any help would be appreciated.
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Thursday, June 24th, 2010 AT 4:15 PM

9 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Lets start by running the codes to see what the computer is telling us. Hear is a link to help:

https://www.2carpros.com/articles/odb1-isuzu-1985-1994-cars-and-trucks-code-retrieval-procedure-and-definition

Please run down this guide and report back.
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Thursday, June 24th, 2010 AT 6:21 PM
Tiny
LITTLEROOFER
  • MEMBER
  • 1 POST
  • 1992 ISUZU RODEO
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 128,000 MILES
My check engine light comes on and off a couple times a day. Then all of a sudden without warning I went out to start my vehicle and it will not run right. It idles funny and when I step on the gas it will not rev up. It sounds like it is bogging down. I had to tow it to my house because the top speed is like fifteen mph.
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Friday, August 3rd, 2018 AT 4:49 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi littleroofer, Welcome to 2CarPros and thank you for the donation.

Check engine light on.

Have the computer scanned for code/s-you have a problem within the engine management system that caused the CEL to turn on. This is your starting point of diagnosis, finding out what is going on. We start here and comeback with the code/s.
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Friday, August 3rd, 2018 AT 4:49 PM (Merged)
Tiny
RITZLIMO
  • MEMBER
  • 7 POSTS
  • 1993 ISUZU RODEO
  • 6 CYL
  • 4WD
  • MANUAL
  • 186,000 MILES
I was coming back from a trip and it lost power and started to miss the last forty miles.

Plugs, coils wires are fairly new, (less then 1,000 miles). Compression check showed 180lbs except for the fourth and sixth cylinder, only 150lbs. No water in the oil. Car starts right up, just runs rough hot or cold. Blows out quite a bit of carbon when you first start it up. Average oil consumption for a car with that many miles.

I tried pulling plug wires to see if I notice any difference. Not much difference when I pulled six, car shut off each time I pulled three.

I checked for vacuum leaks, did not see to be any, unplugged choke, throttle body sensor, p to see if there was any real difference, just variance in idle speeds.

I do not know what other information I can give you.
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Friday, August 3rd, 2018 AT 4:49 PM (Merged)
Tiny
IMPALASS
  • MECHANIC
  • 3,112 POSTS
Hello.

Great information on the problem. Thanks. If I understand you correctly, 3 and 6 are the ones that give you the problem. Plugs 3 and 6 run off the same coil. I have attached the picture. The coil may be bad based off of what you say since they are on the same coil. If all the coils are the same which they look like, swap with the one next to it and see if the problem transfers to those two cylinders. That would show it is the coil.

Also have you check for codes? You could go to Auto Zone or O'Rileys and for free they can pull the codes to the car. Most important. Once they check your codes, if they find something and you do not get it fixed and need to get back with us, please make sure you tell us exactly what the code was, number and all. Example, if the code was E0568 O2 sensor bad. Then make sure you give us all of that. While there for free also they can bring their tester out and check your battery, alternator and starter.

I would also take a spray bottle of water and spray all over them while running and see if it acts up.


https://www.2carpros.com/forum/automotive_pictures/248015_Coil_1.gif



PURPOSE
Provides high voltage necessary to ignite the combustion gas.

OPERATION
The electronic ignition system uses a waste spark method of distribution. For example, in this type of system the ignition control module triggers the #1-4 coil pair resulting in both #1 and #4 spark plugs firing at the same time #1 cylinder is on the compression stroke at the same time #4 is on the exhaust stroke, resulting in a lower energy requirement to fire #4 spark plug. This leaves the remainder of the high voltage to be used to fire #1 spark plug.
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Friday, August 3rd, 2018 AT 4:49 PM (Merged)
Tiny
CLAYCFUS
  • MEMBER
  • 3 POSTS
  • 1993 ISUZU RODEO
  • 6 CYL
  • 4WD
  • MANUAL
  • 202,636 MILES
Will a O2 Sensor make the vehicle lose power going up a hill? While on the interstate I can have the pedal to the floor running 75 mph and it will loose acceleration to 60 mph. Also it smells like raw gas.
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Friday, August 3rd, 2018 AT 4:49 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Hi claycfus,

Yes it can but diagnostics should be done to confirm if that is the cause.

Is the Check Engine Lamp indicating and have you tried to retrieve for trouble codes?
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Friday, August 3rd, 2018 AT 4:49 PM (Merged)
Tiny
GENAA
  • MEMBER
  • 1 POST
  • 1994 ISUZU RODEO
  • 3.2L
  • V6
  • 4WD
  • AUTOMATIC
  • 201,000 MILES
Hello, my car loses power when going uphill. It also tends to just stop (not quit running) if I am trying to back over a small bump (like a rut in the road) or back uphill. I push down on the accelerator and nothing happens the engine doesn't rev, the tachometer stays constant. The car starts fine and the engine sounds fine, and it runs okay on flat road surfaces. But as soon as I try to go uphill, I just lose speed. The tachometer stays the same or may drag down a bit. It has a new timing belt, fuel filter, transmission filter, and TPS. I am kind of thinking the ECM is the next likely suspect, but I do not know how to test it? Do you have any suggestions on what else it could possibly be? The vacuum was a bit low at 12-13 lbs. However, when a propane tank was put near the vacuum lines, nothing happened, so no detectable vacuum leak. There are no codes being set.
Thank you for any suggestions. :)
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Friday, August 3rd, 2018 AT 4:49 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan for codes and check fuel pressure, but with vacuum at 12-13 psi at idle check for a clogged exhaust like a catalytic converter problem.
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Friday, August 3rd, 2018 AT 4:49 PM (Merged)

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