If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
90 Accrd surging idle in park when warm
Hi folks,
This has only recently started to happen.. my car is a 1990 Accord EX, Auto, with 178k on the clock. The only work I've performed on the intake was to clean the EGR ports(about 5months ago), and routine throttle-body cleaning. This only happens after the car has been warmed up and out on the highway. The rate of incident is increasing. After letting the car sit and warm up(very cold in PA this time of year) for 15-20mins, idle is fine, drives fine. After driving, when I put the gear into park, the idle will jump from 1000 to 1500rpm(will raise to 1500 over about two seconds, then drop sharply to 1000, and repeat). Putting the car into reverse,D4/3/2/1,or neutral returns the idle to normal. It's almost like when I shift from Park to Reverse: the idle raises for a second, presumably because the reverse gears are kicking in(??? this is just an educated guess ???). The gear indicator *does* indicate it is in park. I have tried shifting up/down through the gears while the engine is off to possibly clean any bad contacts in the shifter unit. No good. I have unbolted the pulsed-air valve(on the intake manifold, the one with the small metal screen in it) and cleaned it with throttle-body cleaner. I also inspected the cold-start air valve per service manual directions(has the wax bi-metal and coolant lines in it to idle high when cold). I took the top service cap off, noted the air flow while cold, waited for car to warm up, and then observed no air flow(normal operation). Any ideas? Thanks folks! -Jamie |
Ads |
#2
|
|||
|
|||
|
#3
|
|||
|
|||
Since the RPM surges when you go from P to reverse, I wonder if your
load sensor is bad. The load sensor is supposed to sense a change of electrical load and adjust the idle accordingly. In your case, the reverse light obviously is turned on and possibly this is detected by the load sensor. Maybe your sensor is just too sensitive and causes surging. It could also be a vacuum leak somewhere. Remco |
#4
|
|||
|
|||
Curly,
Thx for the response. No I havn't bleed the system lately. It's been a year or so that I'v changed the fluid, so i suppose it's about time anyways. I know how to bleed the coolant when refilling w/the bleeder screw, but can the system be bled while it is at capacity? My brother told me to run the car w/the rad. cap off untill the thermostat opens and you see coolant flowing. |
#5
|
|||
|
|||
Thanks for the info 'Teg... It'll be until next weekend that I get a
chance to replace my coolant, so I'll post back then. Regards, -Jamie TeGGer=AE wrote: > Not usually necessary. > > After you refill the system using the bleed screw (make sure the heater is > turned to FULL HOT), start the engine, then bounce the bumper and squeeze > the upper hose once in a while. The level will blip down as bubbles are > ejected. > > Once it stops going down but keeps rising, put the cap back, make sure the > reservoir is full, then drive the car around until the temp gauge reads=20 > full-hot. |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
rec.autos.makers.chrysler FAQ, Part 1/6 | Dr. David Zatz | Chrysler | 7 | February 1st 05 01:43 PM |
Accord idle hunting | [email protected] | Honda | 0 | January 11th 05 03:44 PM |
rec.autos.makers.chrysler FAQ, Part 1/6 | Dr. David Zatz | Chrysler | 10 | December 18th 04 05:15 AM |
rec.autos.makers.chrysler FAQ, Part 1/6 | Dr. David Zatz | Chrysler | 10 | November 16th 04 05:28 AM |
rec.autos.makers.chrysler FAQ, Part 1/6 | Dr. David Zatz | Chrysler | 10 | November 1st 04 05:24 AM |