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Post by Sir Trevor on Feb 25, 2006 21:12:01 GMT -5
No idea what size it is.
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Post by bunbun / Hank on Feb 25, 2006 21:46:13 GMT -5
Engine size can be found on Vehicle Emissions Control Label. This is in the engine compartment, on underside of hood or around the radiator core support.
8th digit of VIN (on dashboard, driver side, look thru front window) 1987 thru 1989:
K=2.0L OHC M=2.0L OHC turbo 1=2.2L OHV W=2.8L V6
So! now that we are on the same page, maybe I can send you more accurate information. Exact engine seems unimportant as book lists it as 2.0 liter engine control system. Then we have the V6. I am going to post this so as to not lose it, then I will delve into the differences in the wiring harness.
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Post by Sir Trevor on Feb 25, 2006 22:06:05 GMT -5
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Post by bunbun / Hank on Feb 25, 2006 22:17:48 GMT -5
For the 4 cylinder, things are pretty much the same, with a couple of exceptions.
RED wire=power into ECM Gray wire=5(or.5--again, too small to read) volts ref DARK BLUE=throttle postn in. BLACK=TPS ground at the ECM.
Now, on this one it shows the GRAY wire(only ONE, this time) going from the ECM to a splice, then splitting off with one leg going to the TPS: one leg going to the MAP: and the third leg going to the A/C pres sensor.
The TPS: the Intake air temp sensor: and the A/C pres sensor all share a common BLACK wire ground at the ECM. The MAP sensor has a PURPLE wire ground at the ECM.
The GRAY wire is the only one listed as having 5 or .5 volts so I cannot suggest a possible splice like we could with the V6 diagram.
So. there ya have it. I hope this provides more relevant information. Like I said way back in my first post on this thread, if you were sane when you started, you won't be by the time your done.
You know how you can tell someone who has been working on cars too long? He is sitting in a corner, twanging his lower lip with his index finger and making funny noises. Oh ya, and his eyes are glazed over.
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Post by Simon De Montfort on Feb 25, 2006 22:43:51 GMT -5
Too bad we cannot just ride street cars and let the transportation company worry about maintenance.
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Post by Hephzibah on Feb 25, 2006 22:49:37 GMT -5
About the sane thing Hank I have to agree. Just reading this .... I'm shaking my head. Boy now there is someone who has a worst time with cars . Sorry Trevor. And Hank Thank God for your books. Do you think we will get to joke him on this this summer? Sooo living by the lake....... No wonder my family moved inward
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Post by Sir Trevor on Feb 25, 2006 22:53:24 GMT -5
What makes thing even more fun are the high winds that keep wanting ot blow the hood closed too
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Post by Hephzibah on Feb 25, 2006 23:02:02 GMT -5
Ohhhh Mannnn That's not good. OUCHHHHHH That's why we want to relocate. Screw this cold and wind along with the cold. But coming from the ancestors who where close to water wellllllllllllll it still in me. Maybe I'll hit an ocean like my brothers did
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Post by bunbun / Hank on Feb 26, 2006 8:09:22 GMT -5
Well, good luck out there today Trevor. It is nasty here. Got a few medium size tree branch's down in the yard, I'll deal with them another day. Getting ready to eat breakfast, then it's off to my Buddy's place to see what we can do with this GMC. Maybe I ought to call him and see if he's nuts enough to still want to do this today. I might have to fire up the plow and go battle the "White Dragon" later on today. I'll check in on the board later on today when I get home. HANK.
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Post by bunbun / Hank on Feb 26, 2006 13:46:08 GMT -5
Well today has pretty much gone to hell in a hand basket! Started out, I started up the van which was parked up by the house, drove it down to the garage as I needed to put a qt of oil in it and load up some tools to take with me to my buddy's place. I get that all taken care of, jump in the van, and the dang fool thing WON'T start! Waz up wit dat? after cranking it over for awhile I said the heck with it, put the stuff in my pickup and headed for Rich's place. I get about 6 miles down the road and it's like I stepped thru the Stargate and onto another planet! Where I have 2 inch's of snow, he doesn't have a flake.
The deal on this GMC pickup is he got it for free. It had been sitting in this guys yard for 6 years and he was tired of looking at it. The engine looked clean so Rich figured if he could get it to run he had a good engine for one of his hot rods. He put a battery in it and it would crank slow but not attempt to fire up. So, that is where I come in. He figured if we could push it down his driveway (it's about a quarter mile long) and "pop" the clutch maybe we could get it to run. No such luck! we hooked up the battery and we have horn and headlights, but no power at the ignition switch. Where it had cranked over before, now it will do NOTHING! Since the electric fuel pump would not power up (it's fuel injected) pushing it was a waste if time as it was NOT going to fire, no matter what. So, we decided to heck with it, we'll play with it more some other day when we have much better weather. "MY" storm was starting to move into his area by then and since he doesn't need this thing running right now we said screw this working out in the snow.
Well I got home, figured I would warm up a bit before I go out and see way that darn van won't start. Never a dull moment! HANK.
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Post by Sir Trevor on Feb 26, 2006 22:30:16 GMT -5
Well, at least I have good news on my side. First the weather today is a lot better than yesterday. While yesterday was a bit warmer, it was windy as all get out so it felt colder. It was also overcast. Today was nice and sunny and actually comfortable. (oh yeah, not a bit of snow around here either) Found another circuit putting out 5 volts. The one on the aircleaner assembly. followed the wire back to the transmission area where I could work. Cut it, and cut the one for the TSP spliced them together. Car ran pretty good, but not great. So I got to thinking I need to do this farther back so I can feed power to the MAP also. Follow it back to the passenger side and cut and splice things together. Hardly ran and had no power at all when giving it gas. So, I cut the MAP out of the circuit and it's back to running good but not perfect. Not sure what the problem is with adding the MAP into the circuit, but I will live without it. Took me another 3+ hours to put everything back together though. Trying to put the covering back on the wiring harness really sucks! But I didn't mind. Only real problem is just before it shifts, it kind of flutters. Mildly annoying but I will adapt. Much better than only being able to drive 20 MPH
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Post by bunbun / Hank on Feb 26, 2006 22:33:03 GMT -5
So Trevor... Whats up with the Buick? You just say ta heck with the darn thing and take the day off? Can't blame ya if you did, it was COLD out there today. Not the kinda day you want to be out in trying to do precision work like trouble shooting a wiring harness. I got the van started. Don't know what his problem was. I went out about 2:00 P.M. and it fired right up I guess it just wanted to be ornery this morning. Who knows. HANK.
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Post by Sir Trevor on Feb 26, 2006 22:37:31 GMT -5
Look at the post above yours Hank I'm done with it
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Post by bunbun / Hank on Feb 26, 2006 23:06:19 GMT -5
Well, I can give you the low down on what a MAP sensor does and why and how it does it and maybe that will help if you have any more trouble with this thing.
The MAP sensor reports engine load to the ECM which uses the information to adjust spark advance and fuel enrichment. The MAP sensor measures intake manifold pressure and vacuum through a hose connected to the intake manifold. A pressure sensitive ceramic or silicon element and electronic circuit in the sensor generates a voltage signal that changes in direct proportion to pressure. The MAP sensor serves as the electronic equivalent of both a vacuum advance on a distributor and a power valve in the carburetor.
Some of the most typical driveability symptoms associated with problems in the MAP circuit include:
Detonation and misfire due to increased spark advance and a lean fuel mixture.
Loss of power and/or fuel economy and sometimes even black smoke due to retarded ignition timing and a lean fuel mixture
Hard starts and/or stalling.
So, if you are having any problems along those lines, now you know why.
Isn't this fun? Yupper, ranks right up there with having a root canal without Novocain. HANK
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Post by bunbun / Hank on Feb 26, 2006 23:09:45 GMT -5
Ya. I saw that Trevor. Ya beat me to the draw by 3 minutes. You must have been typing at the same time as me and just finished first. I guess that will happen now and then. HANK.
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