Dashmaster
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Posts posted by Dashmaster
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Ronnie, Wires are New from Reatta Store, Plugs my old Rapid Fire #14 all good. Coils checked Primary/Secondary with Meter, They are 6 months old Standard Motor Product brand.. ICM is Airtex one week old. I did try to swap back in the old Delco, But it quit working car would not start.
Before the Lock and Unlock issue car was running perfect. Only new parts that are in place now are. TPS, ICM, Wires, OX sensor, MAF.
I did not check the wires since they are new. They are AC Delco Brand but made in china.
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Its is running very good with this minor exception. Hope to meet lots of you in Allentown. Good Looking Taillight, Still has bad paint though.
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TPS is new, Set to .4, sometimes settles to .38. It looks good from ECM, My old one is good to and was set to .4
My miss or stumble happened again this morning pulling the fist Mountain. 73 mph needing to accelerate a bit more, 4th gear locked misses a couple of times randomly, give it more pedal it kicks down to 3rd no missing up into the 3K rpm range at all.
My fuel pump is 3 years old, Delphi unit I think. Its just running in the lower spec range. After Allentown I plan to replace it and then
install some Bosch 3 injectors. I could have an injector going bad at specific frequency. RPMs in 4th are just above 2k rpm range. If it was fuel pressure I would think it would miss during the kickdown the running higher RPM's
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Guest, See page 5 of this there are several pictures, They did not turn out as good as i thought. Hope to see you in Allentown.
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I did not start out with fresh ECM but did unhook battery so I could re-mount ECM. So it did start fresh. The Miss was more
pronounced at first. The I decided to change a couple of things back. put my Rapid Fire #14 plugs back in and put the old fuel
regulator on. I get better pressure reading with the old one. After the plug change it was much better, Drove it to where I catch the commuter train a 25 mile run on the highway pulling some good hills at speed. I had it miss maybe 2 times right after I got on the highway pulling the first large hill, Nothing after that. I had to slow down once due to a slow driver, to get back up to speed it kicked down and went. Nothing else rest of the trip. I will be driving it daily to make sure the bugs are out of it.
I think the EMI shield is there because this MAF is used on other GM cars that have the coil pack on the same side as the MAF. Truly just my speculation.
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I am leaving on Thursday about noon, I am using 81 N to 78E. Its about 2 and a half hour trip for me. Will be at the Rendezvous Thursdays evening..
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I am very Thankful for all the help and suggestions on this problem, I can say I learned a lot more about the engine on the car and what the CRT can and can't do.
All the work I have done was worth it. It run so good except for the high RPM stumble. Best it ever has. If not having this problem I would still be running around on vary bad timing chain and tensioner. I now also have a good selection of spare parts for backup.
Since the old MAF would give ECM reading from about 6.2 at idle and into the 20 driving. I suspect it had no square wave data. The ECM won't show that. I am surprised it did not act up when tapped on.
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Have slight new issue, High RPM stumble or miss. Only when you give its lots of throttle, Example,kick down to pass, its over 3K RPM when it does it very briefly. Car may still be learning the MAF.
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PROBLEM RESOLVED
The MAF solved this problem
Here are pictures of the old and new Delphi MAF with EMI Shield
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1
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I will take pictures of it all. The Paper that explains the EMI cover. Box and both MAF's. The picture on Rock Auto did not show the EMI cover. Looked like all the rest of the MAF's
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I think there is a pressure test port. I saw in on the FSM which I do not have right now. I was going to look at mine to see if a temp probe can be used in it. I have put a temp sensor in a 91 700R4 years ago.
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Will do, The Box also has a warning paper in it telling you to install the cover if not already on the unit. It on the sensor as shipped still sealed in the packaging.
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Received a Delphi MAF yesterday. I will install it this evening and see what it does. One interesting thing is this one comes with a EMI cover to block outward signals. I did not see it on any picture of any brand sensor i looked at.
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I also did some TV repair in High School, Mostly B&W TV's but some color also. The high voltage flyback transformer connects to the back of the tube and its what fires the electrons in the tube. So adjusting the from the back of the tube fired up will be quite
dangerous. If i remember correctly voltages on the TV's were 20k to 40k volts from the flyback transformer. I had a color set once that had the insulation crack on the flyback wire to tube. It arced to chassis ground about 3 inches long, big blue arc. Fixed it with a dab of silicone.
You might be able to adjust it powered off, You can discharge large caps by shorting with a screw driver.
If it was mine I would send it to Eddie
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I took it out for a drive when I got home, Started it then brought up the ECM data screen, Looked at the IAC from cold. It readjusted down to 20 after about a five mile drive with several stop lights. Car ran fine with except for problem.
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I will take another look at IAC. I was not sure what direction the count should go, My mind thinks closed should be zero, and any opening a count up. Car was warm when I did a reset on it. I will try again tonight and see what it reads.
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It was just an interesting read I found, and you are way ahead of me on this and the chips. I do have an electronic and computer related background. But I have never tried to decipher any thing like this. You and Padgett are why ahead. Thank You for your
suggestions.
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Thank You!! I forgot it was in Celsius.Had so many things going in my mind is becoming mush.
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One other question. The ECM shows coolant temp at usually 94 to 96 degrees. Yet if you are looking at Gauges it shows almost 200.
What is the normal reading for coolant temp in the ECM Data screen. I am thinking these 2 reading are coming from different
sensors, Are my data numbers way off? Or is this normal?
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My IAC count was reset with engine warm so I am sure it will be lower when started and cold, In gear with load could go lower a little. I have ordered a new MAF. Since it is old and has a affect on fuel mixture, Not sure if it could activate the DFCO. I read an article that was talking about MAT and MAF cars late OB1 and some early OB2. He stated the in some of these cars the MAT maintained the
timing and MAF controlled the Fuel. Some were a mixture of the 2 sensors. I am not sure what the relationship is on our cars
between the MAT and MAF.
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TPS .38 not 3.8. Yes ECM showed open loop, with OX unplugged, Car was up to 96 degrees shown from ECM. Problem still
occurred, IAC was stable at 79 , did not budge during the problem, only changes when I open the throttle.
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Coolant Temperature was from cold 60 to 96 during these test. The system never went into closed loop during the OX test.
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I did the IAC reset before test drive to make sure it was set by the ECM. My TPS is 3.8 at Idle.
The IAC was reading 79 off throttle and stays there off throttle.Car Idles fine at 750 RPM and varies very little. IAC steps up during driving. from 79.
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Tonight's Tests
1. OX sensor unplugged, Problem still exists!! So the OX sensor is reading the condition not causing it.
2. Trans electrical unplugged, Problem still the same, so the TC is not involved.
Since OX is reporting lean, The only other thing that can adjust fuel mixture is the MAF
The MAF sensor on the car I will assume is original or at least 10 years old, I do get readings for it in the ECM, tonight the reading were about 6.8 at idle into the 20's driving.
I did reset the IAC and its set at 79 with no throttle.
I guess I will order a MAF, I am thinking of trying the Walker.
45 to 50mph Issue, Feels Like TC is locking and Unlocking
in Buick Reatta
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I agree it could be a bad wire. I will have to swap my old ones in after meter check. When I leave in the morning for work its plenty Dark. 4am. Since it does not do this anywhere but the hill pull might not show up but will see.