• Hi Guest! Being a Paying Supporter is NOT a requirement to participate at BCF. However, subscribing will help ensure we can continue to serve the LBC community for years to come. If you enjoy BCF and find our forum a useful resource...Please consider supporting us by **Upgrading**
    (PS: Subscribers don't see this banner)
Tips
Tips

Midget 1500 idle problem

boxfullofyertoys

Senior Member
Offline
I was hoping someone might be able to help me out with this...

I've noticed the idle seems to creep up toward 1500rpm when I'm out driving. When she's cold, it idles around 1000 unless I adjust it down after she's running, and even then the idle creeps back up when I'm on the road...

Again, I've adjusted the idle on the carb, but it only creates problems when I go to fire up again when she's cold (the idle setting seems too low to get her to fire over easily). I feel like I can't find that perfect balance...

Any thoughts?

I recently put a new Weber DGV on it...could it be the mixture? Wrong jet size?

Thanks in advance!
 

Monark192

Jedi Warrior
Offline
I suggest re-posting this in the Spridget forum here - plenty of friendly helpful Sprite and Midget folks there.

Edit: Guess it has been moved for you.
 

tosoutherncars

Jedi Knight
Offline
Hmm... It must be something that's changing as it warms up... Electric choke on the DGV?

Or... air leak around the intake manifold, that's changing size as everything warms up?

My money's on the choke. I've got exactly the same setup, and when warm it'll idle nicely at 1K, but it won't idle for the first 5 minutes when cold... and that's because I've got the choke disconnected. (lost a little C-clip.)
 
Offline
I had a similar problem with my weber. It turned out to be the nut holding the bell crank on the butterfly shaft. the instructions say not to over tighten this nut or you may move the butterfly in the bore and cause problems. mine used to loosen a little bit every now and then causing the symptoms you describe.


mark
 
OP
boxfullofyertoys

boxfullofyertoys

Senior Member
Offline
tosoutherncars said:
Hmm... It must be something that's changing as it warms up... Electric choke on the DGV?

Or... air leak around the intake manifold, that's changing size as everything warms up?

My money's on the choke. I've got exactly the same setup, and when warm it'll idle nicely at 1K, but it won't idle for the first 5 minutes when cold... and that's because I've got the choke disconnected. (lost a little C-clip.)


It's an elec choke...as of now she's not having any problems starting/idling when cold as long as the idle is set high enough (about 1000rpm or so). After driving her for a bit, I'll pull up to a red light and she's howling at like 1500rpm.

Are you saying that the idle is just flat out set too high for the "choke off" position and it should be kicked down to something much lower? (i.e take her out for a good spin and then pop the hood and turn it down to 900-1000rpm) How will I get her started once she's cold...the good old "accelerator to the floor, turn the key" method? I feel like the car would protest quite a bit if I set the idle that low and tried to start it, but I guess it's worth a shot...I'd rather have to fight a bit to get her started than have my car idling like a bat out of h*ll at a red light :smile:
 

tosoutherncars

Jedi Knight
Offline
That's pretty much what I'm suggesting! :laugh: But once you've got the idle adjusted 'hot', you should be able to adjust the choke so that it doesn't die when cold... I must admit, that's the step I haven't bothered to complete. I just sit in the car and feather the gas for a minute or two. Once underway, it wants to die unless given extra gas for the first minute or two, and then once it's warmed up, everything's fine.
 
OP
boxfullofyertoys

boxfullofyertoys

Senior Member
Offline
Ok, what you've just said combined with some more detailed Weber tuning instructions I just found on the intarwebs, the lightbulb is finally coming on. The instructions I had received with the carb were...well...awful.

So it looks like I have some work to do tonight:
- Double check the mixture
- Reset the warm idle
- Set the fast idle (which I didn't even know existed!!)
- Go for a long ride :smile:

Thanks for the help! I'll let you know how things turn out!
 

recordsj

Jedi Warrior
Offline
I have a similar issue (running a weber 32/26 dgv on a 1500). I can warm the engine up (without driving it around it will idle 800-900 RPMs. But if I go for a drive and sit at a stoplight it will be idling at around 1500 RPMs. Maybe this is what is meant by fast idle speed? (in manuals will you typically see a spec for idle speed and fast idle speed)
 
OP
boxfullofyertoys

boxfullofyertoys

Senior Member
Offline
Recordsj:
Take a look at the link I posted earlier...the diagram shows a lot. Basically (from what I can interpret), the idea is to set the choke and choke screw so that when it's cold the idle is higher than what you've set for the normal idle (when the car is warm). As the choke opens, the idle gradually reduces itself back to a normal idle. I'm honestly still having some problems getting it to work the way I want, but maybe I'm just being too picky for my own good :smile:

Midget78:
No PCV valve here. Just a breather line that goes from the valve cover to the base plate on the carb...
 
OP
boxfullofyertoys

boxfullofyertoys

Senior Member
Offline
Argggh!

Ok, So I spent some more time in the garage tinking with the carb, and I can't seem to adjust the cold idle without affecting the choke. When I tighten the cold idle adjustment screw (the one behind the choke unit), the choke wants to open as well. When I back it off, I'm right back where I started with a good warm idle but no control on the cold. Adjusting the choke first and then trying to adjust the cold idle doesn't seem to help either...

Am I missing something? I took a look at the old DGV that I replaced, and it seems like the two anjustment points (cold idle and choke) operate independently of one another, which makes sense to me...

Argggh!

Any thoughts?
 
Similar threads
Thread starter Title Forum Replies Date
boxfullofyertoys Midget 1500 idle problem MG 0
G 79 Midget 1500 overheating Spridgets 2
G General MG Leaking Fuel on twin HS4's 1500 MG Midget MG 5
B COMPLETE DROP-IN Rebuilt 1975/6 MG Midget 1500 engine PLUS rebuilt Spitfire Overdrive trans NEVER INSTALLED Spridgets Classified 0
A 76 Midget 1500 Oil filter Spridgets 6
M Wanted Twin carb manifold for 1500 Midget or spitfire Spridgets Classified 3
Steve P. 1500 radiator in an earlier 1275 cross flow Midget? Spridgets 2
aseriesspares Spitfire What Gearbox are you using. Spitfire / Midget 1500 Triumph 2
aseriesspares What Gearbox are you using. Midget 1500 Spridgets 5
T Putting a Spitfire 1500 into a 1972 Midget Spridgets 6
DanLewis 1500 cc MG Midget Radiator in a Bugeye??? Spridgets 5
J 1500 mg midget fuel issue Spridgets 2
J 1500 midget master cylinder Spridgets 10
T ZS Question for 76 1500 midget Spridgets 33
T 76 midget 1500 oil pressure lines? Spridgets 15
frankenstang57 Educate me on the Midget 1500 MG 4
R Overdrive/5 speed options for 1500 Midget? Spridgets 15
P how to replace rear main seal in 1500 midget Spridgets 2
R pcv valve for 1500 midget? Spridgets 12
R spark plug for a 9:1 ratio 1500 midget? Spridgets 5
T 76 midget 1500 engine crud Spridgets 4
RickB Seat recovering, 1500 Midget Spridgets 18
R 1500 midget clutch inspection? Spridgets 3
R oil feed kit for 1500 midget? negatives in this? Spridgets 5
Rhodyspit75 Spitfire Midget carbs and manifold on 1500 Spit Triumph 6
D Vacuum unit for 1500 Midget Spridgets 7
P holes in 76 midget 1500 front bumper Spridgets 6
R compression test procedure on 1500 midget Spridgets 5
G 79 midget 1500 clutch? Spridgets 5
A MIDGET 76 1500 CLUTCH SLAVE CYLINDER Spridgets 1
bcbug Midget 1500 Hose Connections Spridgets 9
RickB Midget 1500 dual circuit Master Cylinder troubles Spridgets 7
7 79 midget 1500 Emission Removal Spridgets 3
G 79 mg midget 1500 wiring Spridgets 7
bcbug 1500 midget carb replacement Spridgets 38
A 1300 cam bearings in Midget 1500 Spridgets 3
M 78 1500 Midget Tire Sizes Spridgets 1
J Midget 1500 electronic ignition? Spridgets 10
S 1500 Midget air intake Spridgets 1
S 77 Midget 1500 gearbox Spridgets 4
tony barnhill Patriot 1500 Midget Headers Spridgets 3
R k&n air filter p/n for weber dgv on 1500 midget? Spridgets 7
M 1978 MG Midget 1500 Original Paint Color Options Spridgets 11
M Weber DGV Carb Conversion for 78 MG Midget 1500 MG 0
M Weber DGV Carb Conversion for 78 MG Midget 1500 Spridgets 26
c5racer Spitfire 1500 Spit exhaust manifold fit a 1500 midget? Triumph 2
B Midget 1500 Waterpump Pulley Spridgets 0
B MG Midget 1500 Flywheel Spridgets 4
Steve P. 1500 Midget; sticking choke Spridgets 6
P Midget 1500 starts when cold; doesn't when warm Spridgets 9

Similar threads

Top