| Author | Message | ||
     Michael G. Duckworth (Hampton_89rr) Member Username: Hampton_89rr Post Number: 41 Registered: 04-2003 |
I have a 1989 RRC that has had the following recently done: new cap, rotor, wires, plugs rebuilt distributor On occasion, once I start the truck, it will rev high for a few seconds and then when the idle goes to normal idle, it dies. Then I cannot re-start it. After 10-15 tries, I can get it started, but have to get driving fast or it will stall. Once driven for awhile, it does not stall. Could this be a vacum hose problem? Any suggestions are greatly appreciated. Thanks, Michael | ||
| Steve Cooper (Scrover) Senior Member Username: Scrover Post Number: 711 Registered: 09-2002 |
Could be the stepper motor (air idle valve). Can you get it to idle with the A/C on? SC | ||
| Aaron Richardet (Draaronr) Senior Member Username: Draaronr Post Number: 451 Registered: 09-2002 |
What about your base idle. It might be set too low now. Oh yeah the RRC is for sale Michael $7500 if you know anyone interested. I think I am going to get a new disco for the wife, so I will start to build the 97 disco. | ||
| A. Ali (Alia176) Member Username: Alia176 Post Number: 163 Registered: 03-2003 |
Very good chance, it's your stepper motor. Located on the pass side, rear of the intake. Has a connector with four pins in it. You can take off the connector, remove the stepper motor, clean both surfaces and see what happens. A large crescent wrench will work fine. There's a tiny orifice that should be cleaned, located on the intake plenum. Also, check all vacuum hoses for cracks and splitting due to age. You can buy a stepper motor for a reasonable price if needed. I can't remember what GM vehicle you should tell the counter person. | ||
| Michael G. Duckworth (Hampton_89rr) Member Username: Hampton_89rr Post Number: 42 Registered: 04-2003 |
Thanks for the quick suggestions. I have cleaned the stepper motor several months ago, however it may not be bad to replace it since I believe it is the original. I am in the process of replacing the vacuum hoses, however I have not found any cracks. Could bad 02 sensor cause this also? Other thoughts were possible bad ground. Once I get it started once and it shuts off, it doesn't want to turn over again. It happened a couple of weeks ago, however I drove it 130 miles on Friday(no problems). Now I cannot keep it started. Aaron - my wife has a '02 Disco and loves it - except for the gas mileage and I wish we would have gotten an SE. If I think of anyone interested in your Classic, I will let you know. Are you going to put it down at Wrightsville? That is where I sold my last one. Are you going to Uhwarrie this year? Thanks, Michael | ||
| Steve Cooper (Scrover) Senior Member Username: Scrover Post Number: 713 Registered: 09-2002 |
The stepper motor that works for me is a Wells AC102 from Autozone. It's about $39. You may also have to adjust the base idle for a new stepper motor. SC | ||
| Aaron Richardet (Draaronr) Senior Member Username: Draaronr Post Number: 453 Registered: 09-2002 |
Michael I have an aftermarket stepper motor at home, new. I also have a genuine stepper that works but used. Yes I am definitely going to Uwharrie, just not sure which vehicle. I will probably just drive it with a sign. Most people in town know the vehicle and I am in no hurry to sell. Let me know if you want to try one of the steppers. You can call me at 297-6677 | ||
| Geoff 93 RRC (Geoff) Senior Member Username: Geoff Post Number: 261 Registered: 11-2002 |
Could be water temp sensor (for the EFI not the guage). Does this happen when warm? I just replaced mine and warm starting appears fixed. The old one had a lot of scale build up which could have affected the readings it sent to the ECU, causing the motor to run too rich. | ||
| Michael G. Duckworth (Hampton_89rr) Member Username: Hampton_89rr Post Number: 43 Registered: 04-2003 |
I thought I had a fix from a suggestion of Chad. I found that the air mass sensor connector was loose. I made sure that it was connected well, however I still cannot get it started. It no longer starts for a few seconds and then dies. It just will not turn over. Could the stepper motor cause this to happen? I am going to spend some time this weekend making sure all electrical connections are good and no leaks in vacuum hoses. Based on it not starting at all, should I change the stepper motor? Thanks, Michael | ||
| Geoff 93 RRC (Geoff) Senior Member Username: Geoff Post Number: 265 Registered: 11-2002 |
I'm a DIYer but here's what I'd try: Are all of your breathers clean/clear? Poke a pin through the middle of the one at the rear of the valve cover on the driver's side. The big one on the opposite cover eventually clogs, and then the T piece down the line becomes stopped up with carbon. These need to be clear for proper vacuum. Without proper vacuum the fuel pressure regulator doesn't work correctly as it works against the difference with manifold pressure. Check that the connection from the wiring harness to the ignition amplifier (on the side of the distributor) is firmly connected. Its easy to disturb it changing the cap, etc. Check the connections to the coil. How old is the coil? Pull a plug or two and make sure that they are not fouled. Check for spark by placing it on the exhaust manifold to act as a ground while someone cranks the motor. Try holding very slight pressure on the gas to open the butterfly a little when starting. If that helps might point to stepper motor. Are you getting any codes on the LED readout under the passenger seat? (not sure if there on an 89) - check with ignition on before you reset computer. Disconnect the battery for a few seconds to reset the ECU. I think it starts in a default mode without sensor input and goes from there. Make sure you have your radio code first. If it degrades it could point to a sensor assuming spark and vacuum good. Check the "air" gap on the distributor. Have you changed the timing? Might need to recheck. |
