Prius (Gen 3) :: How To Check Engine Compression
Apr 7, 2015
With vehicle engines in the past, I have used a compression check as a fundamental part of routinely checking the wear on an ICE. My usual method was disconnecting the ignition, removing spark plugs, inserting the compression gauge line in a spark plug hole, and turning over the engine with the starter. How exactly do I do that sequence with a Gen 3 Prius?
If that method is not feasible, would a "leak down" method of checking compression such as we did on old aircraft engines possibly work with the Prius ICE? To do that I would have to be able to carefully position the crankshaft so that the intake and exhaust valves were fully closed on each cylinder in turn. What is the safe method to do that with the Prius ICE?
Exactly what the compression reading should be? I am assuming that if the engine is spun at 1000 rpm by MG1, the correct reading would be 13 to 1 or 13.5 to 1. Or?
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I have a 2005 Toyota 4Runner. 355,000 miles. No problems with it until now. About 2 weeks ago Check Engine Light came on. I replaced spark plugs (they were due), checked coils and fuel injectors and still have Check Engine Light on with code P0301 (Cylinder #1 missfire).So compression tests were done and cylinder #1 had 120 psi and others 170. I suppose 120 isn't terribly bad but is significantly lower than 170.
Question 1: If I reset the check engine light (turn it off), do you think it will pass California smog test?
Question 2: What do I need to cure the problem? Engine rebuild? JDM? or retire the truck?
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Our beloved 2004 Subaru Forester has the check engine light on. We've been told that the 4th cylinder has either low or no compression. Is this fixable/worth fixing? Would you replace the engine? The car has 183K miles on it, and runs great! It is stuttering now, due to this issue, but otherwise - runs great and is in good condition!
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About a week ago I was driving my Pontiac 2003 Grand Am V6 and it began to violently shake and the "check engine light" came on and started blinking. I then immediately took it to the mechanic It has been with the mechanic for 6 days and they were unable to locate the problem. They called me today and I was told that I have no compression in one of the cylinders (I have done business with them before and felt comfortable in that I wasn't being taken advantage of). Also, is there any problems in the future with getting a cylinder replaced i.e. other parts of the engine that might correlate?
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2006 Subaru B9 Tribeca, 160,000 miles. Misfire throws check-engine light twice daily, compression leak, getting worse. Valve job? or trade?
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Picked up a 2001 Passat today, it doesn't run. At first I thought it was a timing belt and I was prepared to fix it, but it's NOT the timing belt.. The belt looks good. The car turns over with no interference, I took the valve cover off and everything looks fine. But, the engine has ZERO compression.. it turns over with ease, and a compression tester doesn't even register. The car has the following codes:
16486 P0102 163
Mass Air Flow Circuit -G70: Low Input [Sporadic]
16395 P0011 035
A Camshaft Position (Bank 1): Timing Over-Advanced or System Performance
16712 P0328 163
Knock Sensor 1 Circuit Bank 1 -G61: High [Sporadic]
16717 P0333 035
Knock Sensor 2 Circuit Bank 2 -G66: High
17733 P1325 035
Cylinder 1-Knock Control: limit attained
17735 P1327 035
Cylinder 3-Knock Control: limit attained
17734 P1326 035
Cylinder 2-Knock Control: limit attained
16725 P0341 035
Camshaft Position Sensor (A) Circuit Bank 1: Range/Performance
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I had My VW tiguan 2011, Died all of a sudden, where went to supermarket and went out and the car is not starting at all.
So next morning had it towed to the dealership for investigation. Now after a week of tests and investigation and replacement of Fuel HP pump @ the engine still not working.
They did pressure test, and surprise came "no compression on all 4 cylinders".
They will need to open the engine and do further investigation. Hope it's just a gasket leakage
The car is still less than 5 years and mileage is 174K km, just made oil top up and general checks few days before the incident. all services @ dealership if not on-time, before time.
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If Prius has to constantly spin the ICE when over 42 mph, even when only running on battery power, it must waste a lot of energy overcoming ICE compression all the time. Or is there some kind of system to reduce compression in this situation – just curious....
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Initially I brought the car in for repair because the engine was cuting out at higher speeds so they replaced all 4 coil packs and did an oil change.
After 50+miles of driving it was taken home. Later on we tried to start the car and it wouldn't start. The car has power and it cranks.
We then bring it back to the shop and they say there is no compression. I suspect conventional oil was used.
Would the wrong oil cause my problems? 2008 VW Passat Turbo...
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Does this sound like a choke issue? The car starts up fine and runs like a top. It even drives normally for about a mile, but then as the engine warms up it starts losing compression when I press the gas pedal. The engine runs fine when my foot isn't on the gas, but stutters and won't go anywhere when I'm pressing the gas.
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I just posted on here a few weeks ago about a flashing engine light possibly caused by low compression getting worse. And it was determined that a used engine would be the way to go because the rings were so bad. Since then I did some research and found that low compression can also be caused by coked rings. I did have a wet compression test done that pointed to the rings as the culprit. But is it possible that the low compression is not bad rings but coked rings instead and that something like Auto-RX might might be worth a try? Is there any way to test for coked rings or are the results from the wet compression test enough proof that the rings are bad without a doubt?
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My 2004 F-150 5.4 has a rattling noise coming from the passenger side of the engine when at operating temperature. The cam phasers and all related parts have been replaced. The reason I was prompted to change the phasers, chains, guides and tensioners was due to the engine stopping on me as I returned home from an errand. The engine had already shown signs of needing the phasers replaced.
The engine runs very smooth while warming up. Vehicle lacks power and has a rough idle after warm. Took the truck to a local mechanic, in the process of making a diagnosis, he performed a compression test. Cylinder 3 psi was much lower than the other 7 cylinders, the mechanic recommended replacing the engine (possible bent valve).
I have a Haynes manual, have searched youtube and checked this and similar forums, I have yet to find instructions on the removal of the head from the block.
(2004 Ford F-150 5.4 3v)....
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Is it possible to tune ECU settings to increase compression ratio and adjust sparks timing for higher octane fuel for octane 98 gasoline or ethanol E85 octane 106?
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Recently there has been a series of problems popping up with the Prius. Its a 2003 model year.
- About four nights ago the warning icon and check engine light (picture below) popped up upon engine start-up and i noticed a weird idle. It seemed to idle rough. After about 20 seconds of idling the engine would shut off. After about 10 minutes and 6 or 7 attempts to restart the engine the warning lights disappeared and idle seemed to be restored.
- The afternoon after that the same warning icon and check engine light popped up along with the rough idle. After about 10 minutes and 6 or 7 attempts to restart the engine the warning lights disappeared and idle seemed to be restored.
- After this incident it seems like the vehicle is getting bad gas mileage. The picture below shows me getting an average of 25mpg. I was driving very conservatively. Driving the same way i usually do, i usually get 45-50mpg. The vehicle seems to be charging the battery more than usual.
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2006, 2G, 43000K. This has happened twice now. Both times on an extended trip of 3+ hours in hot weather: Cruising along at about 70 MPH, the engine just quits. RED Triangle; check engine light; and vcs light. Turned everything off. Car would not restart right away, but after waiting 15 minutes or so, the car restarts and runs fine. All warning lights off except check engine light.
Immediately drove to a Toyota dealership where the following codes were found: P0AOF info 204 (Engine failed to start); and P3190 (poor engine power). The Tech checked the EFI relay; checked for oil puddled in intake; and checked for a contaminated MAF sensor. "No problems found"!
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I got my oil changed today and thought everything (10 am) was fine with my car. I drove it straight home after the oil change. About 4pm I drove it to work and no problems still. Finally tonight on my way home right as I turned on to my street the car at first seem to hesitate. Slow a bit and I pushed the accelerator. Then suddenly as I pulled in my drive way the engine began to shake as though I was about to stall and the check Engine light came on as well as the big red triangle.
This has happened before. The display being lit up like a christmas tree so but this time the engine shook. I turned the car off, check the oil, which is full and the coolant which is full. The engine has not shook yet ( but I wont leave the car on for a long time to see if it happens again) the Red Triangle has turned off and now only the check engine light remains.
I am going to call Firestone, that is where I got the oil change all I know is that they did a routine check up (unauthorized by me) and told me I needed a new water pump drive belt and tires and a air filter..... So I am hoping they didn't touch something by mistake. I told the man that I would much rather have that done by the dealership.
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Started my 2010 gen 3 Prius 3 the other day and got a bunch of what I thought was engine clatter and the check engine light came on.
The next time I started it, no noise. Anyways brought it to dealer and they diagnosed it and ordered a new manifold.
The next day when the part arrived, I brought in the car. Talked to the mechanic, a great guy, and he explained what happened. Apparently, the clatter is actually the springs rattling in the clutch mechanism of the starter motor/electric motor and not the valves like I thought.
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I put 4 qts Mobil 1 motor oil in, with a new Mobil filter. Drove 400 miles no problem. Parked car a week. Drove car to find CEL on. Can overfull oil cause this? (I heard it can cause lower gas mileage.)
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My car has 120.000 miles and regular maintenence done on schedule. Yesterday, after a 1000 mile / 4 day trip, after a break at a service station, the engine srudded violently (for being a prius, it felt like a diesel) while cranking up durin acceleration.
The check Engine light came on.
Using Can-view, I noted these DTC codes: P0101 C3100 P0000
And cleared the memory.
The check Engine switched off.
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I have some check engine lights. And there is one light on my monitor screen in the top left. That one is a hybrid system warning light I think. I'm sure I need to connect it to something to read the codes.
It is running fine, but the engine doesn't seem to shut off and mpg in city is kind a like a normal car, and I think the battery drains too fast. No matter how slow I take off it won't use the electric motor alone. I wonder if that is the battery causing engine to have to stay on.
It keeps cycling off and on charging the battery, but engine never shuts off.
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Had my C4 now for 3 weeks. About a week ago filled it up for the first time. Three days later the CEL came on so took it to the dealer (checked gas cap first and it seemed fine). Dealer told me that the code indicated that I gassed up with the engine on. This is my first car with push button start. I pushed it once, car said "see you" and I filled up. Am I not turning it completely off? Is there something more I should be doing?
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