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EGR Delete CEL *POSSIBLE FIX*?

 
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Old 05-18-2010, 04:19 AM
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EGR Delete CEL *POSSIBLE FIX*?

Will this work? I just got my new egr plate and i'de like to install it. I just need to know if this solution will work?

Quote:
Originally Posted by Qveon View Post
you can do it what you need is a relay and a 0-5k ohm rheostat from radio shack. Now on the drivers side tower where the egr solenoid is located, you will see the plug from the ECU that operates the EGR solenoid to allow vacuum to go to the EGR valve. On top of the egr valve is also a plug for the lift sensor.

Wire your relay so that instead of going to the solenoid, it goes to the coil of the relay. Cut the wire going to the ECU for the EGR lift sensor. Then wire the relay so that the wire on the pole goes to the EGR life sensor wire going to the ecu and the normally closed position is wired to the EGR lift sensor wire going to the sensor itself. Then the position that is actuated needs to be tied to the Rheostat set at about 2200 ohms and then after that needs to be spliced into the EGR lift sensor's 5v wire.

There and WALA, no more CEL for a non-working EGR. This is a lot easier to do right at the ECU. If you have a Pin readout of the ecu wires, then do this right there and you won't have to run any wires across the engine bay.
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Last edited by chris89; 05-18-2010 at 10:14 AM.
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Old 05-18-2010, 04:38 AM
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Re: EGR Delete CEL *POSSIBLE FIX*?

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Originally Posted by chris89 View Post
Will this work? I just got my new egr plate and i'de like to install it. I just need to know if this solution will work?
about a year ago, before I got a chipped ecu.. I made this thread on another website..... it worked for me without all the relays..

try it first.. keep in mind that this was an old post.., about a year old.... so excuse my lingo....lol


now the egr fix...if your lame like me and still using the p13....(only temporary)
I kep't throwing code 12 at high rpm, I also have a egr block plate.


when I had my b20a, i had block plate where the egr tube connects....so there was no problem...ran perfect that way

now with h22,....Sounds to me that when I hit high rpm and the ecu wants the egr valve to open......the valve cannot open.....because the block plate holds the valve shut from being sealed......make sense? like a suction cup

so I drilled a small breather hole where the "round" hole would be....It won't matter since the "rectangle" hole remains sealed.....and now suction from the block plate to egr valve is eliminated...

I have not thrown any more codes, cel's...whatever since....I think for me, problem solved...try it out..

now the valve can move as if it were really doing its job, the sensor sees it and the computer loves it.....check out my very detailed pic.....

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Old 05-18-2010, 06:20 AM
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Re: EGR Delete CEL *POSSIBLE FIX*?

That makes perfect sense and i think it would work! Very Cool. It makes me think though, that why would you have to drill the hole? When you could just lay the EGR valve anywhere under the hood and leave it plugged in right? That way it wouldn't be like a suction cup and it could open and close freely, without having to drill into the egr block plate.

thanks

PS - I'm OBD2 since my prelude is a 1996. What ECU does the 96' cars use? I've heard the older h22 prelude 93-95 use ODB1.
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Old 05-18-2010, 08:39 AM
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Re: EGR Delete CEL *POSSIBLE FIX*?

I put the hole in egr block plate, because the vacuum hose can't pull the valve open, due to a airtight space between the egr valve opening, and the surface of the block plate...

think of it like taking a straw and trying to suck through it while your hand is covering the other end.., its not going to happen.., simple right? the egr block plate is like your hand.., and the vacuum line connected to the egr is like the straw.., drilling a hole in the circle side of the block plate, takes away the "hand", which allows vacuum line to open and close valve..., at the same time no exhaust enters intake manifold... the ecu needs to see that the egr valve is doing its job, if the valve still opens, no CEL ... if valve fails to open, "bam" you got a CEL

I suppose you could relocate egr.. you can also take off the heavy steel housing from the egr, leaving just the sensor and valve..., then stash it somewhere, still plugged in of course...

I think I explained this ok, does my running off at the mouth make sense....?
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Old 05-18-2010, 10:01 AM
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Re: EGR Delete CEL *POSSIBLE FIX*?

Well i understood the whole theory behind drilling the hole, from your first post. I'm going to try and relocate it. Possibly even mount it elsewhere to keep it from vibrating and making noise. The only things I see as being a slight problem is the fact that the EGR connector wire is short, and may need to be extended to accommodate the relocation. Buying some vacuum hose won't be a problem.

The reason why I want to do this in the first place, is to keep my intake air charge cooler and keep the intake manifold spotless. After all the work i've done in cleaning, I would hate to have to remove the intake manifold again in 6 months, to do it all over again. Ya know? I think i'm going to remove it again anyway to clean it again before i block off the egr port. I was wondering how you would go about thoroughly cleaning the EGR port tract on the manifold? When i was cleaning the tract, there was a fair amount of carb cleaner flowing from the furthest runner hole (#4), but not from the other 3. After cleaning it for nearly 20 minutes with several cans of carb cleaner, i managed to get a tiny bit of flow from the (#3) runner hole. I was unable to get anything out of the first 2 holes. I Just wanna make sure it's clean so none of the crap up in there will make it's way into the runner after cleaning and blocking off the egr. Do you know what i mean?
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Old 05-18-2010, 11:23 AM
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Re: EGR Delete CEL *POSSIBLE FIX*?

Quote:
PS - I'm OBD2 since my prelude is a 1996. What ECU does the 96' cars use? I've heard the older h22 prelude 93-95 use ODB1.
96' uses the P13 (OBD2). Yes, the 92-95 Preludes are all OBD1.
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Old 02-22-2011, 01:11 PM
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Re: EGR Delete CEL *POSSIBLE FIX*?

Quote:
Originally Posted by ben_deez View Post
I put the hole in egr block plate, because the vacuum hose can't pull the valve open, due to a airtight space between the egr valve opening, and the surface of the block plate...

think of it like taking a straw and trying to suck through it while your hand is covering the other end.., its not going to happen.., simple right? the egr block plate is like your hand.., and the vacuum line connected to the egr is like the straw.., drilling a hole in the circle side of the block plate, takes away the "hand", which allows vacuum line to open and close valve..., at the same time no exhaust enters intake manifold... the ecu needs to see that the egr valve is doing its job, if the valve still opens, no CEL ... if valve fails to open, "bam" you got a CEL

I suppose you could relocate egr.. you can also take off the heavy steel housing from the egr, leaving just the sensor and valve..., then stash it somewhere, still plugged in of course...

I think I explained this ok, does my running off at the mouth make sense....?
So I did what you said and i've done it numerous different ways. I always get a code either after 4-5 driving cycles or 1 driving cycle at around 5 miles it pops the CEL again. Here's some pics of what I tried. I've tried a hole in the block plate to allow flow from exhaust into the valve as well as a hole for the intake into the valve. All come out to be less or more time before it will pop the code after a certain amount of driving cycles. I'm thinking I may have to do the 2200 k ohm rehostat trick to get it from popping up. It's Very annoying. I just want my engine to run perfectly.


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Old 02-22-2011, 02:07 PM
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Re: EGR Delete CEL *POSSIBLE FIX*?

updates!!! These might work! on our cars... 2.2k ohm resistor on egr sensor... not sure which one exactly at the moment... Here u are..

EGR bypass - ECU resistor mod - success!! - Volvo Forums - Volvo Enthusiasts Forum
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Old 09-01-2011, 01:56 PM
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Re: EGR Delete CEL *POSSIBLE FIX*?

I to believe you have something there
I will do further investigation on this
Egr delete with no cel!!!!

I also deleted my egr with my skunk2 mani an pulling a code 12
Which acts like a wide open vacuum leak!
Bogs down an lags on acceleration ...
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Old 09-02-2011, 07:45 AM
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Re: EGR Delete CEL *POSSIBLE FIX*?

When I deleted the egr, i placed a plate in between the valve with everything hooked up. I noticed minimal driving problems but I put it back to stock since I didn't perform the bypass. I'm going to go to a p72 with an obd2 to obd1 conversion harness and have them set it up exactly as I want. With no EGR detection, and no 2nd o2 sensor requirement. You can specify every detail of how you want it including better fuel mileage and better power up to etc. Pretty cool! it's going to run me like $350 in total and once I get it, to perform perfectly I need to have it tuned on a dyno. Otherwise a stock (slightly improved) h22 base map would be applied with a different IAB activation rpm and different vtec activation rpm. IAB's at 3,500rpm, and vtec at 4,250rpm. Rev limiter at 8,000rpm. With the modified base map the engine can make power above 6,800rpm with mods.
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