| Author | Message | ||
     Brian Baker (Doubleb) New Member Username: Doubleb Post Number: 22 Registered: 02-2002 |
I cleaned and replaced the stepper motor. This really had no effect on the idle problem but was suggested by many and it was dirty. The culprit was the breather hose from the passenger side valve cover to the plenum. The connection to the plenum was clogged. After cleaning the connection, the hose was collapsing form its new found vaccum pressure and needed to be replaced. High idle is now gone. | ||
| Rick Cordova (Imx) Member Username: Imx Post Number: 47 Registered: 08-2002 |
Brian, Im some what new to working on Rovers so forgive this but what and where is the stepper motor? My Rover has been acting the same and the dealer adjusted the base idle it seems to have worked but it still sounds a bit high to me. | ||
| Tony Zuniga (Tony23007) Member Username: Tony23007 Post Number: 154 Registered: 05-2003 |
I have checked my plenum connection and found it really dirty with oil and grime, how exactly did you clean it and with what??? Just wondering since I am experiencing some high idle at start and low idle when I change to gears into R and D?? | ||
| Steve Andrews (Sillybus) Senior Member Username: Sillybus Post Number: 307 Registered: 08-2002 |
Tony - I cleaned mine last night with non-chlorinated carb cleaner. I used a clean rag and sprayed a bit on it to wipe what I could. For the rest, I just sprayed a bit at a time and wiped out what pooled to the bottom of the chamber. I also manually moved the butterfly to fully open from the outside and held it open so that I could get to it better. FWIW - I am in an ongoing battle to fix my high idle problem. 99 D1, idles extremely high in P or N and just a tad high in gear. I've cleaned the IAC, replaced the TPS, blah, blah, blah. I will beat this one day ;-). | ||
| Jaime Crusellas (Jaime) Member Username: Jaime Post Number: 82 Registered: 05-2003 |
Rick, Click on tech, then FAQ, then What's the stepper motor. | ||
| Jordan Pettigrew (Klecko) New Member Username: Klecko Post Number: 24 Registered: 05-2003 |
I am experiencing the exact same issues with my idle. When running warm and I start it with the air cond. on it will set up properly. Start it cold and it sets up at 1500 to 2000. I am replacing the tps today. Last option will be ECU. | ||
| Steve Andrews (Sillybus) Senior Member Username: Sillybus Post Number: 311 Registered: 08-2002 |
Jordan - Let me know how the TPS fairs out. I put in a brand new TPS yesterday and it didn't seem to make a diff. Latest update. I pulled the IAC out of my 96 and put it in the problematic 99. First startup, it seemed to be the fix. Ran like a champ. I rode over to Blockbuster, shut the vehicle off and guess what happened when I started it back up? Stinking idle went through the roof again. I guess the ECU "fixed" itself on the drive over. I think its time to drive the 1.5 hrs. to the closest LR shop. | ||
| Jordan Pettigrew (Klecko) New Member Username: Klecko Post Number: 25 Registered: 05-2003 |
New TPS had no effect. Same high idle. We had really hot weather yesterday and when i was downtown the idle shot up to 2300. I have access to a new ECU for 650.00 cdn. I am close to buying it. It was also suggested to try adjusting idle screw(cheater screw) located under throttle assembly. What do you think about that? By the way steve what initiated your idle woes? Mine started when I had the engine cleaned (I will never do that again). | ||
| trevor griffiths (Trevorgriffiths) Member Username: Trevorgriffiths Post Number: 139 Registered: 11-2002 |
We have seen more than a few high idle situations show up in really hot weather. Often, the coolant temp sensor is telling the ecu that the coolant is really hot, and the ecu responds by raising the idle on start-up to circulate the coolant quickly. Some were fixed with cts, some with rodding out the radiator cores- partially clogged means partially transferring heat which results in elevated temperatures. Brian, did you check the plastic 'oil seperator' in the passenger's side valve cover? When these clog, the engine's crankcase vent system can' perform it's job, sucks the hoses through themselves and creates numerous oil leaks. It will probably break so you may want to have a replacement ready p/n ERR4563 | ||
| trevor griffiths (Trevorgriffiths) Member Username: Trevorgriffiths Post Number: 140 Registered: 11-2002 |
Also, adjusting the base idle speed without a scan tool is a little hit or miss. It can be done, it just takes longer to get it right. | ||
| Milan (Milan) Member Username: Milan Post Number: 239 Registered: 10-2002 |
Jordan, If you had the intake system "cleaned" (by injecting carb cleaner or similar into the intake), it may take couple of days for erratic idle to disappear. | ||
| Brian Baker (Doubleb) New Member Username: Doubleb Post Number: 23 Registered: 02-2002 |
Before you replace the throttle position sensor get a voltmeter (multimeter) and expose the bare wires to the tps. Turn your key to the on position without starting the engine. Use the positive lead of the voltmeter to fine the main power ( as your face the engine wire on the right) it should read around 5 volts. Now move over to the wire on the left and move the throttle cable as you move the throttle cable the volts should slowly work their way up from .5 volts to around 5 volts. if this happens the tps is functioning correctly. I might have the wires order messed up because it has been a week and I was at a wedding and drank way to much. |
