|
|
|
#1
|
|||
|
|||
560SEL idle surging
Upon surfing forums for a while, I didn't really see anything that had my specific symptoms so I'm asking here.
Most of the forums talk about a high idle or fast idle. I don't have any of that. When the car is cold, I turn the key and it pops up to about 1100 or 1000 rpm....then within 5 seconds the rpm drops back down to the 650 or 700 or whatever and is normal. So those two things are fine. However, here is the problem. Like clockwork, about 20 seconds later, I hear some sort of click like a relay or who knows what and it starts surging. It surges up for about 1.5 seconds, then back down for 1.5 seconds. Just up and down, up and down in a rhythm. It's only surging like up and down maybe 500 rpms. On the low side of the surge it sounds like it may sputter like it would die, but catches itself. Other than that the car drives fine. What's weird is the idle is fine and steady upon first startup. If I let it cool for 15 minutes, and start it again like it's a 'new' day, it does the usual 1000 rpm for like 5 seconds, slowly drops down to 650 or 700 and holds it just fine. Then after 20 seconds again, some sort of "click" and the surging starts. The click almost sounds similar to when your ac compressor kicks in, but of course I have the air off. Any ideas?? |
#2
|
||||
|
||||
I'm pretty new to these petrol engines but it seems to me that all of these systems consider temperature as part of the engine management system. So I would quickly check all electrical connections to as many of the thermostats you can identify as possible!
I would then also see if you can read any fault codes from the engine management system - these days the car has some way of telling you what is wrong.
__________________
1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior Don't leave that there - I'll take it to bits! |
#3
|
||||
|
||||
Quote:
I wonder if it could be emissions related, maybe something with the smog/air pump engaging. Quote:
After that 30 seconds or so the electronics take over and start to vary the mixture by reading the myriad of sensors and adjusting the EHA. Duty cycle (viewed at X11) should now start to vary. If it sits at a certain percentage (10,20,30%,etc) and does not vary then the CIS-E unit is indicating a fault.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|