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93Dak
Dodge Dakota
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5/27/2004
09:11:06
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 Subject: Low compression?
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I did a compression test last night on my 93 4x4 with the 3.9. I had 5 cylinders that were right around 120 psi, and one cylinder that was at 90 psi. I did the test on a hot engine, but I didn't add any oil to the cylinders. Should I be concerned about this? It only has 160,000 miles on it!
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Dan
Dodge Dakota
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5/27/2004
09:25:50
| RE: Low compression?
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I'd relocate your iat, and do the tps mod then try again. If that doesnt help swap to a synthetic like amsoil. That should help alot
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IntenseDak39
*GenIII*
5/27/2004
09:38:51
| RE: Low compression?
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how the hell would that effect the compression??
that's a big difference... but i wouldnt be complaining if i had 160K on the motor. Try adding a little bit of oil and see what that does. If the compression goes up... rings are a little worn. Also, what cylinder was it?
6.6 Lt. Big Block, 727 TF shift kit, 452 heads, edelbrock 750 cfm, .513/.513 284/300 crower cam, comp cams springs, comp cams pushrods, 1.5 roller rockers, dp intake, mopar ignition, mopar windage tray, dual exhaust w/ 40 series flowmasters, 4.10 gears, coilover drag suspension, approx, 3500 lbs
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93Dak
Dodge Dakota
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5/27/2004
09:52:56
| RE: Low compression?
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It is the cylinder on the driver's side closest to the firewall. (Not sure of the number.)
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93Dak
Dodge Dakota
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5/27/2004
09:54:12
| RE: Low compression?
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And there is no way that I'd switch to a synthetic oil on an engine with 160,000 miles.
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Dan
Dodge Dakota
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5/27/2004
10:00:46
| RE: Low compression?
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Yes there is, doesnt the drain plug still work or is it rusted in place from being so old? You just need to spray it with wd40 then use a wrench to remove the plug in the oil pan. make sure you have a pan handy to catch all the oil that comes out or it will make a mess. After all the oil comes out take your wrench and reinstall the plug. There will be a cap on the top of the motor that says "oil" that is were you pour the new synthetic oil in.
Amsoil is the best, it should fix your problems.
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93Dak
Dodge Dakota
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5/27/2004
10:27:58
| RE: Low compression?
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Ok....
I am not switching to a synthetic on this truck. It's not worth it. Oil has nothing to do with compression in this case, and a TPS mod certainly doesn't.
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Dan
Dodge Dakota
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5/27/2004
10:41:17
| RE: Low compression?
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Do the tps mod, relocate the iat then switch to amsoil. Its a proven fact it helps these trucks run better. Just ask amsoil guy (the site sponsor). I dont see why it wouldnt help compression if it makes the truck run better.
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IntenseDak39
*GenIII*
5/27/2004
10:55:28
| RE: Low compression?
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damn...
that's all i can say.
6.6 Lt. Big Block, 727 TF shift kit, 452 heads, edelbrock 750 cfm, .513/.513 284/300 crower cam, comp cams springs, comp cams pushrods, 1.5 roller rockers, dp intake, mopar ignition, mopar windage tray, dual exhaust w/ 40 series flowmasters, 4.10 gears, coilover drag suspension, approx, 3500 lbs
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Dan
Dodge Dakota
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5/27/2004
11:27:15
| RE: Low compression?
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If you guys would actually do your homework and research these mods you would know what I am talking about. I have been around these boards for years and have a very fast 99 v6. I know what i'm doing. Take the time to read and learn and it will be easier to fix your problem
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?
Dodge Dakota
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5/27/2004
11:43:35
| RE: Low compression?
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Message:
When engine has 160,000 mile on it
without previously using synthetic
the oil Consumption would put the poor
Guy in the POOR house..
Do as Intense Dak says - spray a little oil
in that 'low' cylinder and see what that does
to the reading - higher = rings
Then -go from there = If you really want
rebuild or get a new engine -rebuilt or otherwise
But even as your engine now is - it should go
for a long while yet..........and not on
synthetic oil - just a good quality normal oil.
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93Dak
Dodge Dakota
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5/27/2004
11:50:48
| RE: Low compression?
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That's what I needed to hear... I've driven it for the past year and a half this way, (20,000 miles or so) and it's just a reliable old engine. I'm not planning to have any work done on it to bring the compression up in that one cylinder.
Dan, what do you think would happen if I removed my intake and throttle body and did a compression test? Did you know that I can still do a compression test without a throttle position sensor and an incoming air temperature sensor?
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Dan
Dodge Dakota
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5/27/2004
13:31:39
| RE: Low compression?
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Wow, are you trying to blow your motor up? Removing the tb and sensors then trying to do a compression check???
Wow, I'm just glad that isnt my truck....
one day you will learn I hope...looks like its going to be the hard way
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?
Dodge Dakota
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5/27/2004
13:37:41
| RE: Low compression?
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DON'T mess with what ain't BROKE..........
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93Dak
Dodge Dakota
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5/27/2004
13:40:21
| RE: Low compression?
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Dan: do you know how to do a compression check?
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Dan
Dodge Dakota
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5/27/2004
14:22:31
| RE: Low compression?
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Yes, aparently you dont.
Use the search function
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93Dak
Dodge Dakota
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5/27/2004
15:16:15
| RE: Low compression?
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I'm not sure why I waste my time replying to this since all you do is blow smoke up my ass.
Anyway, I'll try to be civil about this. Dan, I want to explain how to do a compression check so that you don't look like an ass in the future. A compression check simply measures the compression in the cylinder through the spark plug hole. You literally thread a pressure gauge into each cylinder, one at a time, where the spark plug normally goes. You disconnect the ignition components (coil wire) so that the engine won't start, and then you crank it for a couple seconds. The guage measures the pressure.
The pressure in the cylinder has nothing to do with the incoming air or fuel. You can do a compression check with an engine on a hoist with a starter connected (and a 12volt supply).
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IntenseDak39
*GenIII*
5/27/2004
18:55:47
| RE: Low compression?
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Dan,
the only things that would cause low compression in a motor is because of worn piston rings, tore up cylinder walls, bad head gasket, worn valve seals or a cracked head. Please explain how advancing your timing a hair and moving your fuel up a little is gonna add compression to that cylinder?
I been here longer, and had a much faster V6 than you.
just curious, what would you recommend a person do if they had the same problem with a motor that didnt have a TPS or IAT... rotate the distributor?
6.6 Lt. Big Block, 727 TF shift kit, 452 heads, edelbrock 750 cfm, .513/.513 284/300 crower cam, comp cams springs, comp cams pushrods, 1.5 roller rockers, dp intake, mopar ignition, mopar windage tray, dual exhaust w/ 40 series flowmasters, 4.10 gears, coilover drag suspension, approx, 3500 lbs
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Dan
Dodge Dakota
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5/27/2004
20:53:08
| RE: Low compression?
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I'm sorry but I doubt you had a faster v6 than me. The iat and tps are two very important parts of the motor. I would get into it but you guys probably wouldnt understand. Use the search function and you will learn alot.
peace and chick grease...
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93dakman
Dodge Dakota
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5/28/2004
00:16:59
| RE: Low compression?
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Wow, The more I read from this post, the dumber I get. Dan, quit playin stupid, its not funny, we all hate people like you. If you are as smartand fast as you say you are, tell us all the mods on your truck. Tell us EXACTLY how you did them, and also tell us how the TPS and IAT are the most important parts of the "motor". (I thought motors were electric). So tell us Dan, are you 12 years old and trying to get your sh its and giggles for the day? Why don't you pay us all a favor and go play in traffic.......during your 5th grade recess hour.
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akaproph
Dodge Dakota
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5/28/2004
07:34:15
| RE: Low compression?
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Thats a hard claim to be faster than Intense39. I think hes the only person to actually turbocharge his v6. Use the search function and you will learn alot.
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