Topic

Heat wave issue (35°C)???????????? Stalling at once, but I could drive back home without too much trouble, foot kept on accelerator pedal...

Today, still no MIL light on, but feeling like one cylinder could be missing fire!!! Spark plug lead disconnected???
Stalling within 1 second, I mean!

I even feel unable to get out of the yard for a road test, alas. Much too hot today for any engine failure...

................

Loss of spark on one cylinder will cause rough running may make it harder to start but wouldnt necessarily kill the ability to idle

Other than loss of idling how is the engine running. If you hold the pedal at say 1500 rpm does it run steadily and smoothly ?

Hi, Thx 4 helping...Sending my cheap OBD 327 app report, just in case...The 1st was in March not much different than today, black oneJust had a try: - Yes, I can run steadily between 1000/1200

Its worth using the Search feature to see idle problems encountered by others. Here are a couple, and it would be worth searching for more; see if any of these are the same as your symptoms

https://www.the-t-bar.com/forum/9-mgf-tf-pitstop/90197-unstable-idle

https://www.the-t-bar.com/forum/9-mgf-tf-pitstop/55392-low-idle-revs-nearly-to-point-of-stalling#55467


https://www.mgfregister.org/forum/viewtopic.php?t=1762

This one describes the idle control valve ; https://www.the-t-bar.com/forum/22-cjj-s-guides/26538-replacing-the-idle-air-control-valve-iacv

Its worth reading as much as you can. These cars have been around a while so most problems have been experienced and solved

I did read few pages since issue... IACV reset (when warm?!?), etc.
Not an unstable IDLE but none at all!

Being lazy (until I need to remove engine cover), I just asked myself if disconnecting the battery would help?!? No trouble except radio memory. Instead of trying an IACV reset from cold (even already tested)...
I did charged it thinking it was week (12,5V)...


I'm now guessing the alternator belt doesn't like starts & stops...

Has it made any difference to the idle when you disconnected and reconnected the battery then reset the IACV ?

Battery at 13.6V after a night charge, but nothing better this morning...
Not able to get the engine warm for the IACV reset (tried "cold" anyway)......

Took off engine cover this afternoon...
Only tried the little breather hoses disconnection...
One was effective. Too low & unstable revs (5000-9000) idle...
BUT, what does it mean?
Air filter wasn't too neat... Very thin clear dust covering the engine compartment.
At that point, not a huge work to have a check of the stepper motor...
I still wish to understand this lack of air flow somewhere...

Well done for getting this far. Definitely replace the air filter. if it is dirty it will restrict performance and complicate your fault finding.

No change coming from new air filter, though!


And disconnecting IACV plug or manifold air pressure sensor <=> stalling

Wondering if my tools are sensibly efficient...

spring stop screw setting?
Unsuccessful attempts...