95.5-2004 Tacomas & 96-2002 4Runners 4th gen pickups and 3rd gen 4Runners

Bad compression, time for swap?

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Old Nov 21, 2004 | 10:17 PM
  #1  
OneTrickToy's Avatar
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From: San Diego, CA
Bad compression, time for swap?

So I've been dealing with lots of issues on my 3VZE. Thought it was some basic maintainance that hadn't been done but that didn't solve the problem. I checked the compression today and I get around 155psi on 4 of 6 cylinders. Cylinder 4 is down at 100psi and cylinder 5 is down at 60psi. I'm not too happy.

So I started searching and reading through all the swap info. But it seems like there's too much info. I'm having a hard time finding some good info on prices, and which is the best swap. I'd love to have a diesel, but I also would like to do a swap that makes sense $$$ wise.

So... which swap makes the most sense? I want reliability and better gas mileage than the 3VZE. I'm talking with some friends in BC to see if they have any connections on Canadian Diesels.

I have a 5spd, and I don't have/need: Tach, AC, CC.
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Old Nov 21, 2004 | 11:13 PM
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Did you figure out if the problem is in the top of the engine or the bottom?
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Old Nov 21, 2004 | 11:21 PM
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also did you redo the test? something about putting oil in the cylinder and redoing the test.... anyways, what about emissions testing? you may not have smog testing in WA, but i wonder if there are engine swap legalities?
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Old Nov 22, 2004 | 09:43 AM
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It's kinda funny. With as many hippies and tree huggers as we have in my county, the ONLY thing they haven't attacked is our vehicle laws. We have no emissions laws, and our DMV/registration offices don't even look at your vehicle. They don't really care what you do. Haven't dropped oil in the cylinders yet. My dad suggested that I find out what my mechanic charges to do a compression test. Might be smarter to let him figure it out so I'm not spending any more time "guessing".
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Old Nov 22, 2004 | 11:55 AM
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From: Lacey, WA
i believe we have some swap laws here in washington but you won't find any enforced...we don't even have emissions testing unless you live in a big city, then its a tailpipe check.

i think the best swap for a 3VZE equipped rig would be the 3.4 5VZFE
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Old Nov 22, 2004 | 01:33 PM
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That's what I'm thinking. I just found out I can get just the engine for $1,000 Canadian. What would it cost to get an ECU and harness?
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Old Nov 22, 2004 | 04:51 PM
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if you can, try and get the one with the engine. no real idea on cost figures on the harness and computer though
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Old Nov 22, 2004 | 05:51 PM
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Well, it looks like my parents are going to back me... but not the way I hoped. They are going to co-sign on a loan so I'm paying for it all myself. The engine I can snag is a 96 with only 97,000 KM's or 60,000 Miles. I'm now searching for an ECU and harness. Hopefully I can recoup some of the costs by parting out my engine.
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Old Nov 22, 2004 | 07:35 PM
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If you check out Auto-Rx (search), you'll find tests that have been done that yielded improved compression. I think it's like $25 a bottle and YT has a discount if it is still valid. You may want to give that a shot but it'll take you 4-5K miles to get two treatments through it. I think if you don't have any major mechanical problems then it would be worth a shot. It's a lot easier and cheaper than doing an engine swap.

Anyways, it's just a thought. I'm going to be running some through mine once I get my injectors swapped in.

Good Luck

:bounce2:
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Old Nov 22, 2004 | 10:50 PM
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From: Sonora, CA
Put about a tablespoon of oil in the cylinder and do a compression test.

If compression goes up:
It is the rings.

If compression is still low:
Most likely the valves or head gasket. Head gasket is likely because compression is low in two cylinders next to each other. If the compression stays low after adding oil, try getting the engine hot and slowly dribbling some water down the intake being careful not to hydrolock the engine. Seafoam would be even better. There would be a chance that some carbon is keeping the valve from seating properly and the liquid would cool the carbon quickly and cause it to break off.

Last edited by the_supernerd; Nov 22, 2004 at 10:55 PM.
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