Question about 1993 BMW 325

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What causes high idling and idle surges - 1993 BMW 325

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That is most commonly caused by a vacuum leak, but can also be caused by a cam or crank sensor, throttle position sensor, map or maf sensor,
if you have a check engine light on, that most likely will tell you your problem, if not, check all your vacuum hoses, brake booster, and egr valve, they are the most common places to find vacuum leaks

Posted on Apr 12, 2015

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skychief2001
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SOURCE: would throttle positioning sensor cause my 1987 bmw 325e to idle up high?

Usually it is a sticking throttle plate, vac leak, or a problem with the idle control valve.

Posted on Sep 14, 2012

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Nov 19, 2015 | Cars & Trucks

1 Answer

97 toyota surges at an idle


(which engine. ?????)_
as always check all fuses. and scan the ECU for DTCs. first.
there is no need to fix OBD2 cars like 1980 cars (hard rows to hoe)
it can be 2 problems this......
lets fix the easy one first. idle. (and hope for moving issues to fix for free) it idle car is parked, so is 100% safe tests. (not moving)

so it surges at idle.
questions.?
1: hot or cold or both.?
2: low extreme RPM and high at idle.

400 to 800 RPM? surge.
1000 to 2000. what? numbers tell the tale.

first off, idle is the last thing to work right on any engine.

there are many ways to find what is wrong.
fix idle surge way.
i make sure that the engine holds closed LOOP status.
hot idle, if not , i fix that first.
keep in mind if not in closes loop and lean
all lean engine surge and guess what the ISC will add to the surge
because idle is way too slow, so the ECU open the ISC wider
and wider and its still too slow, so the ECU resets the ISC
this cause a worst hunt (surge)
the ECU adjust spark time and the ISC to get 800 rpm. (spec. look up yours)
so say , i see closed loop failed, OBD2 scan page 1
i look at the O2 sensor an its stuck lean.
if stuck lean and it really is (o2 bad?) then its lean and it will surge
.
examples.
1: i find 02 sensor bad, (only effects idle and light steady cruise)
2: i find fuel pressure at 15PSI , hopeless low .
3: i find all injectors clogged. and lean.
4: with MAF EFI, ( i find maf reading too low, (dirty) causing lean.
5: if MAP car, i find the MAP stuck hard high vacuum causing lean.
not knowing what engine you have or the idle hot surge range,
i can not go farther.

the driving bog tells me,
1: scan the ecu ,get DTCs; do that first.
2: clean MAF if car has one, ask how..
3: check fuel pressure.


my guess is engine is lean. and starving for fuel all the time.
cept WOT.

MAF cars starve for fuel if there are any vacuum leaks.
MAP cars do opposite, they race fast with 100% full power.
MAF is air density EFI
MAP is speed density EFI.
apples and oranges diffr. so what engine.


Jan 07, 2014 | 1997 Toyota Tacoma

1 Answer

Car do's not idle correct irregular idle


what type of vehicle is it? usually an irregular idle is caused by a vacuum leak (high idle for the most part) now a surge could be a problem in your coolant sytem it will need to be bled to stop the surgeing and this is usually a long and slow surge but if your surge is quick or rapid this would most likely be your iac (idle air control) valve typically located on the throttle body. a quick way to check if its working is to take the tubing off and put your finger over the first hole in the body see if its sucking (should be very strong vacuum pressure) reply with more details on the vehicle and whats going with it.

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1 Answer

Need help I am trying to fix the high idling in my chevy s-10 durango. The engine runs high speed. it idles high. Is there a way to fix or adjust this problem?


Thanks for choosing FixYa and welcome. They are a few things that can cause your issue. You may need to adjust your idle or you could have a bad idle control sensor. You need to test your fuel pressure to make sure your not getting too much fuel to the engine. It could also be in your ignition system. You could be getting a power surge within the system. Last resort, take it to a shop to be hooked up on a diagnostic machine. There problems are sometimes hard to find, especially the power surge. You would need to test the wires for improper current.

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I'm having a problem with fast idle and surging on a '92 Toyota Paseo, MT. I have found the two lines broken off the BVSV, could this be causing the high idle/surging?


If BVSV is to do with the brake vacuum servo unit, then yes, it could easily be the cause of the high idle speed. This will cause the engine to run lean too, and admit dust and particles into your engine.

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92 honda accord surges or idles high


Have you install a timing belt recently? If you get it off a tooth it will idle high and surge

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High idle, surge when idling


It's a failed idle air motor, fairly simple , get a new one first and it's just a few bolts and one wire plug, right at or near the throttle body

Good luck, if that doesn't fix it it's the computer

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1 Answer

Surging and high idle on 94 silverado


If your idle is going from 500rpms to 1000rpm's fluctuating at and idle your EGR valve is probably carbon up and needs cleaned or replace.

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