Idling problems nightmare
#1
07-07-2018, 05:27 AM
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Idling problems nightmare
Hi all, I'm sure this has been discussed many times before but I'm having a nightmare with the idling of my 240. I'm very inexperienced with K-Jet still.
1988 240GL automatic 2.0L with standard K-Jet (NO ECU, NO SENSORS)
Basically what happened is this, a few weeks back the car idled fine hot or cold the RPMs were just right however since I have owned the car I've only been getting around 12-15MPG. a few weeks ago I finally decided to address this with a new fuel filter, new spark plugs, new air filter and getting the injectors ultrasonically cleaned and refitted with new seals. Starting it up for the first time after this 'tune up' the engine just wanted to stall itself, easily fixed by adjusting the idle screw so I screwed it out quite some way actually until the engine idled nicely at 850RPM. I'm guessing now the injectors are clean and being more efficient on fuel, the fuel air ratio needed adjusting by means of the screw. Anyway I took it out for a 20 mile drive and I noticed that when the engine was up to temperature the idle speed has shot up to around 1500RPM. Also before, when idling and selecting drive or reverse, the RPMs dropped maybe 100-200RPM at most but now it drops 500-600RPM almost as if the engine has lost a lot of power although it feels like it has more power when driving. I had actually cleaned the throttle body a few months prior but I was advised to clean it again so I did that yesterday but it was still very clean and made no difference. I removed the idle control screw and the o-ring still looks in good condition.
What else can I do?
Peter
1988 240GL automatic 2.0L with standard K-Jet (NO ECU, NO SENSORS)
Basically what happened is this, a few weeks back the car idled fine hot or cold the RPMs were just right however since I have owned the car I've only been getting around 12-15MPG. a few weeks ago I finally decided to address this with a new fuel filter, new spark plugs, new air filter and getting the injectors ultrasonically cleaned and refitted with new seals. Starting it up for the first time after this 'tune up' the engine just wanted to stall itself, easily fixed by adjusting the idle screw so I screwed it out quite some way actually until the engine idled nicely at 850RPM. I'm guessing now the injectors are clean and being more efficient on fuel, the fuel air ratio needed adjusting by means of the screw. Anyway I took it out for a 20 mile drive and I noticed that when the engine was up to temperature the idle speed has shot up to around 1500RPM. Also before, when idling and selecting drive or reverse, the RPMs dropped maybe 100-200RPM at most but now it drops 500-600RPM almost as if the engine has lost a lot of power although it feels like it has more power when driving. I had actually cleaned the throttle body a few months prior but I was advised to clean it again so I did that yesterday but it was still very clean and made no difference. I removed the idle control screw and the o-ring still looks in good condition.
What else can I do?
Peter
#2
07-07-2018, 08:06 AM
Why is everything diagnostic a nightmare?
Somewhere along the line you probably developed a vacuum leak. Drawing in more air would account for the poor idle. I suggest that you check the O rings at the injectors to be sure that they are the right size and seated properly. Also, go back over any vacuum lines.
I am also concerned that you are developing a high idle as the car warms up, almost like the engine temperature is not known. I'm not familiar with the 2.0 and I'm assuming that this is a non-US model. Here in the US they used the old 2.3 and it did have a computer, albeit basic, there were sensors and a circuit board.
Are you absolutely certain that there are no electronic controls?
Somewhere along the line you probably developed a vacuum leak. Drawing in more air would account for the poor idle. I suggest that you check the O rings at the injectors to be sure that they are the right size and seated properly. Also, go back over any vacuum lines.
I am also concerned that you are developing a high idle as the car warms up, almost like the engine temperature is not known. I'm not familiar with the 2.0 and I'm assuming that this is a non-US model. Here in the US they used the old 2.3 and it did have a computer, albeit basic, there were sensors and a circuit board.
Are you absolutely certain that there are no electronic controls?
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