Question about 1998 Honda Accord
I have a 2002 Accord. Owned for 5 years, no problems ever. Had oil changed at Grease Monkey and everything was good. Later the same day the check engine light and TCS light come on. Car runs and drives perfect up to 3500 rpm and then the engine begins to pulsate. Continues to do this as long as its at 3500 rpm. Same symptoms when in neutral. Took to Checker, used code reader, came up with P1259 - VTech System Malfunction. What has happened and how can I fix this? Any input would be greatly appreciated.
Posted on Nov 14, 2009
Low oil level can cause this as well as a bad oil pressure switch for VTEC control, possible VTEC solenoid.
Posted on Jan 10, 2009
I have a 1998 honda accord lx that is having this same problem. check engine light cames on a long time ago so i had a diagnostic ran on it and got the code p1259. i was having my oil changed at the same time this was discovered. i am a woman and in no way mechanically inclined. what should i do? (cheap solution if possible)
Posted on Feb 15, 2012
Check your variable valve timing oil pressure switch, it's located on the passanger side just before the intake manifold, also the solenoid may be dirty or bad. some people say to clean the screen but that requires removing the entire assembly where these two units are... Good luck
Posted on Dec 10, 2009
I have a 99 Honda accord I put it in machine it says the code is P1259Vtec System malfunction.. I have had oil changed, New spark plugs,New Fuses,Oil Filter,Oil treatment,Oil system cleaner,Oil pressure switch,Air Intake system Cleaner,replaced Sender Unit. Went to Get Smogged and It passed EVERYTHiNG Except check engine light... My car cuts out a lil when i drive for 20-30 mins Only a lil. If anyone has any Suggestions That would be great thank u
Posted on Jul 12, 2010
You could have a slipped timing belt, or the senors for the electronic timing may be dirty. If the timing belt slipped you will need to get it replaced. If the senors are dirty, take your car down to your local Grease Monkey and have the oil flushed and changed.
Posted on Nov 20, 2008
OBD 1456 for crv
Posted on Jun 05, 2009
I have a 2003 Honda Civic 1.7L vtec, I have replaced the solenoid valve asembly twice, changed the oil and filter with semi-synthetic. Oil pressure at lower pressure switch is @ 60-75 psi. 60 psi to the solnoid asembly. With the solenoid valve energized I only get 10 psi at vtec oil pressure switch, manual pressure gauge installed. I replaced the solenoid valve twice from dealer. Computer controls are ok it energizes solenoid at above 3000rpms, ok... Any ideas?
Posted on Oct 24, 2012
Try to flush engine oil and use fresh oil 5w-30 a good known brand name oil like gastric or valvoline, if it does not fix the problem, vtec selenide assembly on eBay sell for cheap price, when you have the vtec assembly then call around your local mechanic asking for labor install should be $40-$60 a slows mechanic should take less than 1/2hr to install, good luck.
Posted on May 30, 2012
The VTEC solenoid does NOT lock the lower cam profile rocker arms. These rockers are always locked. The higher cam profile rockers on the other hand, are floating, until the VTEC solenoid allows oil pressure to move the pin that locks the secondary rockers to the higher profile cam lobes.
Posted on Mar 05, 2015
I just had one of these systems in my shop, and it was being repaired for a blown cylinder head gasket. I checked out how this system works and this is what I found.
The cam shafts have two different profiles one for each cylinder, a normal mild cam and a wild profile, above 3000 rpm the solenoid valve will allow oil to change the way the rockers operate, above 3000 the rockers join together and follow the wild profile and below 3000 the rockers follow the mild cam profile.
To allow this to work properly, you must first adjust all the valves, per specifications. This will allow all the valves to close and it will allow the pin that joins the rockers to move freely. this pin is moved by oil pressure and moves slightly when pressurized to lock the rockers together for the two ranges of rpm operation.
The oil valve is controlled by the solenoid, at normal low speed operation it locks the two rockers on the intake side together and they both follow the mild cam profile, Above 3000 rpm the solenoid sends oil to the pin in the rocker assembly, and both rockers follow the wild profile cut in the cam shaft, they become secured by the pin and only one rocker is touching the cam, but being locked together they both are following the wild cam profile
If you have a dirty engine, sludge can make these pins and the whole valve train sticky, and you will experience issues.
Use synthetic oil, have your valves adjusted, check the solenoid operation, and if nothing else get a gasket set from Honda, it has a new screen installed, and clean the V-tec valve out. It would take just a few minutes to check the oil valve system out to make sure it can move freely, and it only has three bolts holding it in. The gasket set, is just two different molded O-ring type gaskets, and is very simple to inspect and clean. Use di-electric grease to hold the O-rings in place while assembling them this allows the O-rings to move while operating, expanding and contracting, don't use RTV gasket maker, it won't work, and will plug the system up. And it will impede the O-rings from working the way they were designed. They are supposed to slide around and seal the area and need a small amount of this Di-electric grease. It won't attack the rubber and is the best stuff to hold the O-rings in while working with them.
Have fun everyone James In Oregon
Posted on Nov 26, 2014
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Posted on Mar 10, 2015
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Posted on Jan 02, 2017
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