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VTEC stopped working after engine flush

 
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Old 10-30-2008, 01:49 PM
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VTEC stopped working after engine flush

Hi, I dont know if anyone has any advise that could help me ? You will have to bear with my mechanical knowledge ;) I have a 1994 H22A honda prelude japanese import automatic. I bought the car recently off ebay for 700. The car isnt in the best of condition but I was trying to get it all up together so it would be reliable for everyday use and a bit of fun in the VTEC. Anyway I noticed that there was an oil leak somewhere so I took it to a local mechanic and he said that it looked like the rocker cover gasket needed replacing, so I went to Honda and bought one and took my car down there for him to fit it. He took the top cover off and it was filled with sludge and carbon deposits and he said that the best thing would be to clean it all up and do an oil/engine flush and have new oil and filter. I got him to do this as I thought it would be the best thing to do, however after collecting the car and taking it for a test run the VTEC doesnt seem to engage properly and the car often seems to hit a rev limiter at about 6500rpm. I took it back to him and he just says hopefully it will sort itself out and he cant see how anything that he has done will have effected it. I checked the oil level and its up to the max so thats not it. I have read somewhere about a vtec solonoid screen ? could it have something to do with that ? Im a bit upset about it at the moment as the VTEC is one of the main reasons I love these cars :( any suggestions anyone ? Rich.

Last edited by bigr1979; 10-30-2008 at 02:17 PM. Reason: extra information
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Old 10-30-2008, 02:23 PM
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Re: VTEC stopped working after engine flush

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Originally Posted by bigr1979 View Post
Hi, I dont know if anyone has any advise that could help me ? You will have to bear with my mechanical knowledge ;) I have a 1994 H22A honda prelude japanese import automatic. I bought the car recently off ebay for 700. The car isnt in the best of condition but I was trying to get it all up together so it would be reliable for everyday use and a bit of fun in the VTEC. Anyway I noticed that there was an oil leak somewhere so I took it to a local mechanic and he said that it looked like the rocker cover gasket needed replacing, so I went to Honda and bought one and took my car down there for him to fit it. He took the top cover off and it was filled with sludge and carbon deposits and he said that the best thing would be to clean it all up and do an oil/engine flush and have new oil and filter. I got him to do this as I thought it would be the best thing to do, however after collecting the car and taking it for a test run the VTEC doesnt seem to engage properly and the car often seems to hit a rev limiter at about 6500rpm. I took it back to him and he just says hopefully it will sort itself out and he cant see how anything that he has done will have effected it. I checked the oil level and its up to the max so thats not it. I have read somewhere about a vtec solonoid screen ? could it have something to do with that ? Im a bit upset about it at the moment as the VTEC is one of the main reasons I love these cars :( any suggestions anyone ? Rich.
yes, the screen could be clogged not allowing enough oil in.
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Old 10-30-2008, 02:24 PM
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Re: VTEC stopped working after engine flush

yeah i was thinking that the engine flush and cleanout may have somehow blocked it, could that be possible at all ? I have found a link showing how to do it so ill do it tomorrow, the link is http://www.preludepower.com/forums/s...d.php?t=287196 for anyone thats interested. What if that doesnt work any ideas what to do next, you dont think that the engine flush could have screwed my oil pump do you and now its not generating enough pressure for the vtec ? rich.

Last edited by bigr1979; 10-30-2008 at 05:12 PM.
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Old 10-30-2008, 11:31 PM
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Re: VTEC stopped working after engine flush

or could be, dont quote me on this cuz i dont know 4th gens, but could it that the car went into limp mode?

someone who knows plz bump in?
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Old 10-30-2008, 11:33 PM
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Re: VTEC stopped working after engine flush

Well I could definitely see how "flushing" everything out of the engine could stir some **** up and clog the VTEC solenoid screen. No check engine light or anything? If it's rev limited at 6500 rpms then it's definitely in limp mode. See if you're throwing any codes and let us know so we can help.
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Old 10-31-2008, 05:05 AM
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Re: VTEC stopped working after engine flush

thanks for the replies guys, i seriously beleive that this has got to be an oil pressure related issue as it happenened just after the engine flush, that pretty much eliminates the electrical issues for now, however i will have a look over just to make sure no wires have come loose when i do the solenoid screen today. ill let you know how i get on if the screen cleaning doesnt do any good then i was thinking, its only a long shot but the guy that serviced the car probably put a cheapo nasty oil filter on it, could it be that somehow that has reduced the oil pressure by being crap or got gunked up already, if the screen doesnt work i was thinking next cheapest thing is to get a new HONDA oil filter and bang it on, other than that im praying its not the oil pump. Ill let you know how i get on.................. cheers, bigr
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Old 10-31-2008, 07:46 AM
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Re: VTEC stopped working after engine flush

*********** NEWS JUST IN ***************
The VTEC is Back :) I cleaned the screen on the solenoid and it did the job, look at the state it was in here ...... http://i467.photobucket.com/albums/r...csolscreen.jpg anyway many thanks for your help im so pleased thats all it was and nothing worse (for now). big R.
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Old 10-31-2008, 09:14 AM
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Re: VTEC stopped working after engine flush

I could see how that would make your car run like **** haha. I know how you feel man. I didn't have VTEC for about 8 months, it was horrible. Congrats on an easy fix.
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Old 12-18-2008, 03:14 AM
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Re: VTEC stopped working after engine flush

so if the vtec is not running correctly the car will rev limit at 6500 rpms and will this cause the tranning to jump a little when u hit the 6.5k mark thinking u have vtec still?
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Old 12-18-2008, 03:17 AM
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Re: VTEC stopped working after engine flush

Yes, that's exactly what will happen.
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Old 12-18-2008, 03:20 AM
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Re: VTEC stopped working after engine flush

wow!i have a 97 honda prelude that is jumpin but cant tell wut the rpms are at cause both tac and speedometer are out.the speedometer went out at the same time it starting jumping and i ha dno vtec so ill try taking this off first.Can i simply clean screen or do i need to complete replace and will they have this gasket at autozone?
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Old 12-18-2008, 03:24 AM
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Re: VTEC stopped working after engine flush

You might wanna check your VSS (Vehicle Speed Sensor) wire first. I know when that goes out, lots of **** starts going wrong (like the stuff you listed). If that doesn't fix the problem, there are lots of things that can cause VTEC not to work. Low oil, engine coolant isn't up to temp (140*F I believe), clogged screen, faulty VTEC solenoid/oil pressure switch.
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Old 12-18-2008, 03:27 AM
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Re: VTEC stopped working after engine flush

the VSS is connected to the tranny correct and i believe there are 2 connect to the top of it visible on left side of tranny on top but i dont know wich one it is there is a green and a yellow i believe.any pointers you can give me besides the F***ing Haynes manual.
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Old 12-18-2008, 05:59 AM
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Re: VTEC stopped working after engine flush

Helms > Haynes lol. The green/yellow wires are for the VTEC solenoid, not the VSS.
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Old 12-19-2008, 10:42 AM
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Re: VTEC stopped working after engine flush

at wut rpm rate should my vtec be kicking in.like i said i just got a honda ive been a all wheel drive dsm guy for 2 years so go easy on me lol.but i am loving honda way more.
and if its not kicking in correctly should i go ahead and clean it even though its working.
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Old 12-19-2008, 11:53 AM
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Re: VTEC stopped working after engine flush

For VTEC to engage, the engine needs to meet a few requirements. First off, the engine coolant temperature needs to be at or above a certain temperature (140*F I believe). Second, if you are low on oil, even a little, VTEC will not engage. There is a certain speed in each gear that you need to be moving for VTEC to engage. Also, VTEC engages at 4900 or 5200 rpms (it varies between H22's). What do you mean by it's not kicking in "correctly?"
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