A 4-Wheels Thread About Absolutely Nothing!

Jiro said:
only the old model. the newer model of Toyota? I avoid it like a plague.
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Yes, different story. Hence the Prius trouble :aw:
 
Jiro said:
I don't. Corolla. what a shitty, underpowered, inferior car.
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:lol: was I asking you the question - I was asking Highlander the question however, I agree with you, I drove the Corolla last year, and it is not too bad but not my type of car.
 
Jiro said:
I don't. Corolla. what a shitty, underpowered, inferior car.
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Yes, It's true. I don't know NOTHING about cars when I was teenage that time. My old 00' Subaru with manual and AWD is MUCH quick than Corolla at almost same MPG. It really sad!
 
The Highlander said:
I never like Toyota's design at all. I don't mean to make negative for anyone who own a Toyota.
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same here. what a terrible terrible terrible terrible design. The 90's design is much better. The latest models right now...... :ugh:
 
Jiro said:
same here. what a terrible terrible terrible terrible design. The 90's design is much better. The latest models right now...... :ugh:
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:ugh2:
 
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If you naysayers dont believe many cars on the road in the usa do have I-4 or H-4 but none have V4. That exception in V8 chevy and gmc trucks have variable fuel management system which shuts down 4 cylinders and run on V4 temporarily. Just go and research.
 
sequoias said:
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If you naysayers dont believe many cars on the road in the usa do have I-4 or H-4 but none have V4. That exception in V8 chevy and gmc trucks have variable fuel management system which shuts down 4 cylinders and run on V4 temporarily. Just go and research.
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I've reading this threads. You are right about the the GM V8s run on V4 during
light cruise or slow speed with light loaded. I think I did post it in the previous threads. They are using ETC not throttle cables. The 5.3L w/throttle cable is not V4. Only to ETC (electric throttle control)
Did you remember about the older Caddiac Fleetwood I think it was 1977-80ish, use V8-6-4? I m not sure about the model year on the Caddy cars.
 
deafsmogtech said:
I've reading this threads. You are right about the the GM V8s run on V4 during
light cruise or slow speed with light loaded. I think I did post it in the previous threads. They are using ETC not throttle cables. The 5.3L w/throttle cable is not V4. Only to ETC (electric throttle control)
Did you remember about the older Caddiac Fleetwood I think it was 1977-80ish, use V8-6-4? I m not sure about the model year on the Caddy cars.
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I think four fuel injections and four spark plugs are shut down by PCM for save fuel efficient for GM. Question, do engine run smooth?
 
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The Highlander said:
deafsmogtech said:
I've reading this threads. You are right about the the GM V8s run on V4 during
light cruise or slow speed with light loaded. I think I did post it in the previous threads. They are using ETC not throttle cables. The 5.3L w/throttle cable is not V4. Only to ETC (electric throttle control)
Did you remember about the older Caddiac Fleetwood I think it was 1977-80ish, use V8-6-4? I m not sure about the model year on the Caddy cars.
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I think four fuel injections and four spark plugs are shut down by PCM for save fuel efficient for GM. Question, do engine run smooth?
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Yes, they run surprisly smooth. You can never tell its running on 4 cylinders or 8 cylinders...it switches depending on engine load. I rented a Chevy Tahoe last year.
 
sequoias said:
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Yes, they run surprisly smooth. You can never tell its running on 4 cylinders or 8 cylinders...it switches depending on engine load. I rented a Chevy Tahoe last year.
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yes, I never feel the V4 performance when I drove a customer's GM suv with a 5.3L, for light road test. I sometime feel it as downshift in the transmission as I hold the gas pedal and maintain steady speed. It might be a V4 mode on but I cant tell the V4 mode is on. Real amaze.
 
The Highlander said:
I think four fuel injections and four spark plugs are shut down by PCM for save fuel efficient for GM. Question, do engine run smooth?
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I did researching the Alldata repair infro today, GM doesnt says anything about disable fuel injectors and cops when the V4 mode is on. But I believe the ECM (engine control module, similar to PCM) disable the fuel injectors.
The actual V4 performance on the V8 engine is Cylinder Deactivation System
referring to "Active Fuel Management". The ECM disable valve lifters in the valley of the engine block: deactive cylinders #1 and #7 on left bank (driver side) & cylinder #4 and #6. ECM ground the 4 solenoids and open oil flow into the hydraulic valve lifters, pressurized the spring loaded locking pins inside the valve lifters, the plunger in the lifter will collapse that mean no pushrod travels upward and downward but the lifters are still traveling by following cam lobes. With V4 mode operation, the cylinder #3 & #5 on LH bank and cyl #4 & #6 on RH bank. It should be smooth running. V4 mode is NOT used on starting, idling and medium or heavy throttle conditions.
One thing is I'm concerning about hydrostatic issue on disable valve lifters that close intake/ exhaust valves. :dunno:
 
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sequoias said:
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Yes, they run surprisly smooth. You can never tell its running on 4 cylinders or 8 cylinders...it switches depending on engine load. I rented a Chevy Tahoe last year.
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Nice! Thank you for the shared. I heard about that in around five years ago but no clue how hell it was work like that way till now.

deafsmogtech said:
I did researching the Alldata repair infro today, GM doesnt says anything about disable fuel injectors and cops when the V4 mode is on. But I believe the ECM (engine control module, similar to PCM) disable the fuel injectors.
The actual V4 performance on the V8 engine is Cylinder Deactivation System
referring to "Active Fuel Management". The ECM disable valve lifters in the valley of the engine block: deactive cylinders #1 and #7 on left bank (driver side) & cylinder #4 and #6. ECM ground the 4 solenoids and open oil flow into the hydraulic valve lifters, pressurized the spring loaded locking pins inside the valve lifters, the plunger in the lifter will collapse that mean no pushrod travels upward and downward but the lifters are still traveling by following cam lobes. With V4 mode operation, the cylinder #3 & #5 on LH bank and cyl #4 & #6 on RH bank. It should be smooth running. V4 mode is NOT used on starting, idling and medium or heavy throttle conditions.
One thing is I'm concerning about hydrostatic issue on disable valve lifters that close intake/ exhaust valves. :dunno:
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Thank you for the info.

Should be disable the fuel injectors or too much RAW fuel in the engine when misfire and probably damage engine and CAT.

The hydrostatic?! It is bad idea to me.
 
Highlander, Some vehicles's PCM shut fuel injector(s) down when the PCM detected misfire cylinder(s) to prevent raw incoming fuel enter the cat converter(s), cuz the PCM doesnt want to ruin expensive cat converters and emitts pollutes. Anytime, if you see the MIL like CHECK ENGINE or SERVICE ENGINE SOON flash ,flash, flash, that means heavy misfire condition, must fix them as soon as possible or pay lot of money on the repairs like cat converters if you ignore flashing MIL.
 
deafsmogtech said:
Highlander, Some vehicles's PCM shut fuel injector(s) down when the PCM detected misfire cylinder(s) to prevent raw incoming fuel enter the cat converter(s), cuz the PCM doesnt want to ruin expensive cat converters and emitts pollutes. Anytime, if you see the MIL like CHECK ENGINE or SERVICE ENGINE SOON flash ,flash, flash, that means heavy misfire condition, must fix them as soon as possible or pay lot of money on the repairs like cat converters if you ignore flashing MIL.
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Yes, I know about MIL flash. Sad, the most 90's vehicle's PCM do nothing when it detected misfire but MIL.
 
The Highlander said:
Yes, I know about MIL flash. Sad, the most 90's vehicle's PCM do nothing when it detected misfire but MIL.
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yup, old OBD-I vehicles cant do any thing with misfire condition only way you can feel the shaky engine.
Many people don't understand what different is the OBD-I and OBD-II. One simple sentence for OBD-I..... OBD-I PCM is reading the sensors for open or short circuit and doesn't test cat converters.
OBD-II PCM is monitoring misfire, EVAP, cat converters, engine sensors, etc etc, can test on cat converters by monitoring front and rear O2 sensors as the PCM protect cat converters. Many times I've been see code P0420 or P0430 cat converter efficiency below threshold value bank 1 or bank 2 on the OBD-II vehicles, they were caused by misfire condition or overfilled oil in crankcase.
They can be fix by clear codes after check oil level or the root of misfire
diagnosis. If code P0420/P0430 persists, replace cat converters. Costly repairs.
 
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