Guest imported_blazer1997 Posted March 24, 2007 Share Posted March 24, 2007 Idle getting worse to point hole dash shutters. Today temp was 86 decided to run the ac. Traffic was stop, and gowater temp was at 203 while sitting in traffic in drive the rpm's dropped from 700 to 350rpm along with the oil pressure from 45 to 30 along with the battery volts.Then the idle would smooth out for about 5 seconds and start all over again. Turned the ac off same problem.As Padgett and other members know i have install just about everything new GM parts except the kitchen sink.Does anyone have any suggestions WHY ??? Again Thanks Larry Link to comment Share on other sites More sharing options...
Guest TommyH Posted March 24, 2007 Share Posted March 24, 2007 i had something similar, and it turned out it was the alternator. did you try that? i would sugest buying one from a junk yard, because they make the new ones a bit different, and they cost a TON more. just my 5 cents Link to comment Share on other sites More sharing options...
Guest imported_blazer1997 Posted March 25, 2007 Share Posted March 25, 2007 Please give me some more info on your problem making the change for another alternator.Maybe missing something here how will the alternator effect the idle? At this pointtry anything. Wife wants me to sell it to much money spent on parts, and still have same problem, but she will just have to live with it. Rough idle, and all its staying. Link to comment Share on other sites More sharing options...
Guest mongeonman Posted March 25, 2007 Share Posted March 25, 2007 If voltage goes down to 9 volts or higher than 16 volts this causes problems with idle,I have been looking in the new product information manual and it says the problem could be in the evaporative emision control system:inoperative purge selenoid,damage canister,hose split,cracked or not connected to the proper tubes.Could also be loose or leaking air duct between MAF sensor and throttle body,i think these have not been mention before. Link to comment Share on other sites More sharing options...
Guest imported_blazer1997 Posted March 25, 2007 Share Posted March 25, 2007 Thanks. Get the alternator checked tomorrow. Throttle body was cleaned, and all new gaskets used.Canister ck it tomorrow for hoses cracked or not connected. Before today had a rough idle but wasn'tbad, and was going to live with it. But today for some reason temp was over 80, and used the air-conditionerand it really got bad while waiting in traffic. Several times it shook so bad the dash was vibratingand thought the engine would stall.So far i have replaced the fuel pump, and screen, fuel filter, ECM, Prom,TPS, low speed sensor,manifold gaskets, pcv, thermostat,cleaned throttle body new gaskets, cleaned all grounds, ck transmissionmodulator valve its holding vacuum, cleaned egr valve, and new gaskets,new pressure regulator, injectorscleaned flow tested pressure tested, oil pressure sensor. Just history of what i have completed, and still have the same problem, but getting worseNothing above has changed anything Link to comment Share on other sites More sharing options...
Guest radiotradio Posted March 25, 2007 Share Posted March 25, 2007 As you know, I am having a similar problem. Changed the coils and ICM today, but no change. Did you check the fuel pressure when it was acting up? I am not going to change much more usless the fuel rail pressure indicates I need a pump. I'm probably going to get a car hauler and pull her by the old Lansing plant on our way north. Maybe that will help the old girl. Good Luck! Jack Link to comment Share on other sites More sharing options...
Guest imported_blazer1997 Posted March 25, 2007 Share Posted March 25, 2007 Ck Fuel pressure, and ck ok when rough idle occurred. I went to search found numerous reatta ownershaving this rough idle problem seems all 89 reatta's.Seems we have all replaced, and cleaned the same parts, and problem still there.Replacing parts gets expensive, and if anyone corrects this problem let the rest of us know.With my reatta one day smooth idle next day its back. But today it felt like the engine was tryingto break loose from the motor mounts only way i can explain how rough it got. Link to comment Share on other sites More sharing options...
Guest EDBS0 Posted March 25, 2007 Share Posted March 25, 2007 I would be thinking of the oxygen sensor again or put the old one back in. Is there any indication that it is running very rich when it acts up? Should throw a code soon? Link to comment Share on other sites More sharing options...
Roadster90 Posted March 25, 2007 Share Posted March 25, 2007 Larry...you just stated your fuel pressure was OK...You intitially replaced some items with used parts (ICM)...DID YOU go back and replace the ignition with NEW components...especially the ICM....coil? Heck, come to think of it though, with quality control the way it is anymore, that may not even mean anything as even if new, replaced parts could be defective <img src="http://forums.aaca.org/images/graemlins/frown.gif" alt="" />. We feel for you......been there. Link to comment Share on other sites More sharing options...
Guest imported_blazer1997 Posted March 25, 2007 Share Posted March 25, 2007 No Codes, This is 3rd oxygen sensor changed Link to comment Share on other sites More sharing options...
Guest EDBS0 Posted March 25, 2007 Share Posted March 25, 2007 It was an obvious try.I am assuming that you have cleaned the throttle body and the throttle plate on both sides. And the IAC.My 89 would get confused a couple of times in the spring and fall when the temperatures got around 40 degrees. It would barely pull its own weight, shook and shaked like a dog. It would happen for a few times each season change and then be gone. It didn't matter whether it had gone closed loop or not.I would say find someone close and start swapping black boxes. Often the simple removal and replacement of a connector will fix an intermittent problem. Have you tried contact cleaner? Link to comment Share on other sites More sharing options...
Guest mongeonman Posted March 25, 2007 Share Posted March 25, 2007 could be restiction anywere in the exhaust system. Link to comment Share on other sites More sharing options...
padgett Posted March 25, 2007 Share Posted March 25, 2007 I know this is reaching but any chance it is a bad motor mount ? Bonne had one fail several years ago and until replaced it felt like the engine was about to fall out. Once the retaining tab makes contact with the loop, all vibration is transmitted. Link to comment Share on other sites More sharing options...
Guest imported_blazer1997 Posted March 25, 2007 Share Posted March 25, 2007 Had alternator checked showing 91.6 Battery was good. Ecm reading in park normal tempECM 01---0.32ECM 04---93ECM 06---4.8 to 5.0ECM 07---0.25 to 0.60ECM 08---10ECM 10---13.5In gear the battery volts are reading 13.3 to 13.6Temp gauge reads from 208 degrees while stopped, and running 199ECM 11---715 to 764ECM 16---0ECM 17---285ECM 18---0 to 57 to 20 to 0ECM 19---128ECM 20---140ECM 21---5.2ECM 22---17ECM 23---45ECM 98---51If anyone can see anything not correct let me know. thanks Link to comment Share on other sites More sharing options...
Reatta45 Posted March 25, 2007 Share Posted March 25, 2007 Larry, EGR valve? I am so happy my 91 dose not have one? They cause many intermittent idle problems. Try to disable it when the engine is running correct. KennyV.PS, what are you referring to ?alternator showing 91.6 battery was good? ??? Link to comment Share on other sites More sharing options...
Guest imported_blazer1997 Posted March 25, 2007 Share Posted March 25, 2007 The alternator think should have output of 120amps when checked this morning only showing 91.6 amps output.A suggestion maybe had a bad battery. Checked at autozone putting load on the batter checked good.So your thinking egr?? I have taken it apart and cleaned it 2 times. Maybe your right. Link to comment Share on other sites More sharing options...
Guest imported_blazer1997 Posted March 26, 2007 Share Posted March 26, 2007 In your post stated 91 doesn't have egr valve. There another reatta owner that has a 90 do it have a egr valve?If 90 doesn't have a egr valve his problem is the same as mine but i have a egr valve? Link to comment Share on other sites More sharing options...
jonlabree Posted March 26, 2007 Share Posted March 26, 2007 90's have an EGR valve.. Link to comment Share on other sites More sharing options...
Guest imported_blazer1997 Posted March 26, 2007 Share Posted March 26, 2007 What think about the readout of the alternator being at 91.6?? One member stated his problem was the alternator.Service manual states should be 120 being at 91.6 think this could cause the idle problem? Link to comment Share on other sites More sharing options...
Guest mongeonman Posted March 26, 2007 Share Posted March 26, 2007 I d ont think the alternator is the problem because if it didnt have enough power to get the car running normaly it couldnt keep the battery fully charged. Link to comment Share on other sites More sharing options...
Guest imported_blazer1997 Posted March 28, 2007 Share Posted March 28, 2007 A GM mechanic today seems to think might be the egr. His suggestion unhook it see what happens i know throw a code but worth a try. Link to comment Share on other sites More sharing options...
padgett Posted March 28, 2007 Share Posted March 28, 2007 Spec for TPS is .38-.42v at idle. Yours is reading .32v. Just something to try. Loosen two screws and rotate slightly.ps 88-90 have 3 EGR valves - small, medium, & large. If one is sticking open a tad, disconnecting will not change, will need to remove and clean (but when removed, can block passages). Might explain engine thinking it is lean (140). Link to comment Share on other sites More sharing options...
Roadster90 Posted March 28, 2007 Share Posted March 28, 2007 Post deleted by nic walker Link to comment Share on other sites More sharing options...
Guest imported_blazer1997 Posted March 28, 2007 Share Posted March 28, 2007 Thanks padget give it try today. Let you know. Link to comment Share on other sites More sharing options...
Guest imported_blazer1997 Posted March 29, 2007 Share Posted March 29, 2007 Mr. Padgett took your advise today on the tps. My tps unit has a metal u shape metal bracket with two holes for the screws, and attaches to bottom of the tps unit. With this bracket there was no adjustment.I removed the u-shaped bracket and reinstalled the tps, using the crt i adjusted it to 36. So 38 would be better?I did notice a change. For now going to drive it for couple days before i comment.Again Thanks Link to comment Share on other sites More sharing options...
padgett Posted March 29, 2007 Share Posted March 29, 2007 TPS unit has elongated holes. With screws loose you should be able to move slightly .36 is not far out of spec but is a little low. Are you able to exceed 4.0v at WOT ? Link to comment Share on other sites More sharing options...
Guest imported_blazer1997 Posted March 29, 2007 Share Posted March 29, 2007 Mr. Padgett took your advise again and moved the tps up to 38. Let you know in a couple days how itsdoing. Again thanks Link to comment Share on other sites More sharing options...
Guest imported_blazer1997 Posted March 30, 2007 Share Posted March 30, 2007 Professor Padgett moved the tps as you suggested to 38 seems lot smoother as of now no surging.Keep my finger crossed.Seen lot of owners talking about seafoam. Shoud i try this, and how, and where pour it in.Know goes in the engine but where? Thanks Link to comment Share on other sites More sharing options...
Guest imported_blazer1997 Posted March 30, 2007 Share Posted March 30, 2007 used the seafoam today. When I restarted the car my neighbor ran over thinking car was on fire.As of today everything seems very good. Keep everyone up to date. Link to comment Share on other sites More sharing options...
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