Hard to fire up when coled

Rolfs MGF · Post by **Rolfs MGF** » Mon Jun 25, 2018 12:36 pm

Hi there.
This is Denmark calling

I got a MGF 120 HP from 1996 for 2 years. When the season started she fired first time just like last year after we replaced sparkpluks, cabls and Things related to make sparkpluks work. She ran like at kitten about a month. For the past 2 months she is very Hard 2 start, runs for at bit then dies. I have to do this up to 10 Times and work with the throttle to get her to breath. When shes warm no problem but in idle she stumble. I took of the step moter and cleaned it. She has 300.000 KM on the clock but sems to be sorted out otherwise
What do i do?

jonaf · Post by **jonaf** » Mon Jun 25, 2018 2:40 pm

If the brown temperature sensor is giving av false signal this may cause the ECU to calculate a too lean fuel mixture.

talkingcars · Post by **talkingcars** » Mon Jun 25, 2018 4:21 pm

Hi and welcome to the forum

Have you done a stepper motor reset?

James

jonaf · Post by **jonaf** » Mon Jun 25, 2018 4:34 pm

https://www.google.no/url?sa=i&rct=j&q= ... 7012386488

Rolfs MGF · Post by **Rolfs MGF** » Mon Jun 25, 2018 5:30 pm

talkingcars wrote:Hi and welcome to the forum

Have you done a stepper motor reset?

James

HI James and thank you. Stepper reset??? No thats propely why the moter ^TALKS^ All the time. How do i do that?

talkingcars · Post by **talkingcars** » Mon Jun 25, 2018 11:33 pm

Switch the ignition on so the dash lights come on.
Firmly and fully press the gas peddle down five times in 30 seconds
(do not rush)
wait 30 seconds
start the engine

Rolfs MGF · Post by **Rolfs MGF** » Tue Jun 26, 2018 7:21 am

Do i each time i press down hold it 30 sec or must i complete the full 5 times whitin 30 sec?

Rolfs MGF · Post by **Rolfs MGF** » Wed Jun 27, 2018 10:02 am

Did the 5 step on the gas pedel and it made the engene run smooth but we discoved that the full pumpe dosent run every time the ignigtion is turned on. We have added at little bit of 2 stroke oil in the gasoline in case of the fuel pump needs lubricent

talkingcars · Post by **talkingcars** » Wed Jun 27, 2018 1:51 pm

Rolfs MGF wrote:Do i each time i press down hold it 30 sec or must i complete the full 5 times whitin 30 sec?

5 down and ups in 30 seconds.

talkingcars · Post by **talkingcars** » Wed Jun 27, 2018 1:52 pm

Rolfs MGF wrote:Did the 5 step on the gas pedel and it made the engene run smooth but we discoved that the full pumpe dosent run every time the ignigtion is turned on. We have added at little bit of 2 stroke oil in the gasoline in case of the fuel pump needs lubricent

It may not run if the pressure seems ok in the supply pipes.

Rolfs MGF · Post by **Rolfs MGF** » Sat Jul 07, 2018 12:44 am

Well we did a dianogstic with bosh and it sayed that the cooling temperture sensor failed and the throttle mixture sensor too. Not sure i found the corect english Word for them but it seems logic since it have a Hard time firering up. Fuel filter is getting replaced when im back from hollydays.

Rolfs MGF · Post by **Rolfs MGF** » Tue Aug 07, 2018 12:18 pm

Both Sensors replaced, gas filter as well. She fires better but sometimes i need to press the speeder an inch down. Hard to keep running without using the gas pedel. Even when shes is warmed up she has hick ups during drive on the moter way and when in idle she stalls . Fires better thoug. Did a chek on the spark plugs, looks fine.
Any idears

ArntyR · Post by **ArntyR** » Tue Aug 07, 2018 2:16 pm

Hi, I think I'd adjust/tighten up the throttle cable on the inlet manifold now and see if that makes the idle better...

talkingcars · Post by **talkingcars** » Tue Aug 07, 2018 9:58 pm

Does your diagnostic Bosh give live data.

What is the coolant temperature when the gauge shows warm?

Rolfs MGF · Post by **Rolfs MGF** » Tue Aug 07, 2018 10:38 pm

Yes the bosh did provide live data. Dont know the temperatur but i Will in the weekend. Think it should be 90 celsius right ?

Rolfs MGF · Post by **Rolfs MGF** » Tue Aug 07, 2018 10:41 pm

ArntyR wrote:Hi, I think I'd adjust/tighten up the throttle cable on the inlet manifold now and see if that makes the idle better...

hmm dont think thats the problem, when it runs idle its at 800 rpm

RobboMC · Post by **RobboMC** » Wed Aug 08, 2018 3:34 am

Check the distributor cap and rotor button??? Just an idea to cross off the list

If not good replace with genuine ones, the Chine copies are rubbish.

Rolfs MGF · Post by **Rolfs MGF** » Wed Aug 08, 2018 7:16 am

Well the spark plugs gives af nice blue spark so all the ignigtion stuff should be fine

scruffygit · Post by **scruffygit** » Wed Aug 08, 2018 8:17 am

I had a similar problem on my 97 vvc. Turned out to be an intermittent fuel pump relay. The one that is in the multi relay unit behind the ecu in the engine bay. Managed to get the unit apart and found dry solder joints on the relay. Soldering fixed the problem.

Sent from my F5 using Tapatalk

ArntyR · Post by **ArntyR** » Wed Aug 08, 2018 1:49 pm

So to recap, absolutely no running probs when warm; it starts ok, idles ok and runs ok?

When cold it won't start unless you pump the throttle 10x and it won't idle? Presumably you have to race the engine to get it warm then drive it?

The MGF Register Forums

Hard to fire up when coled

Hard to fire up when coled

Re: Hard to fire up when coled

Re: Hard to fire up when coled

Re: Hard to fire up when coled

Re: Hard to fire up when coled

Re: Hard to fire up when coled

Re: Hard to fire up when coled

Re: Hard to fire up when coled

Re: Hard to fire up when coled

Re: Hard to fire up when coled

Re: Hard to fire up when coled

Re: Hard to fire up when coled

Re: Hard to fire up when coled

Re: Hard to fire up when coled

Re: Hard to fire up when coled

Re: Hard to fire up when coled

Re: Hard to fire up when coled

Re: Hard to fire up when coled

Re: Hard to fire up when coled

Re: Hard to fire up when coled