A4 1.8T cold start problem - low rpm
#1
A4 1.8T cold start problem - low rpm
When my A4 B5 1.8T sits for 10 hours or longer, it needs quite a few cranks (10 seconds or so) until it starts. Even then, it starts slowly and rough.
When it was working fine, rpms would go higher in the first minute after a cold start, bu it no longer does that. Almost like a missing "choke" - or whatever the equivalent is for these engines.
Do you know what controls the rpm increase for a cold engine? What could cause them to stay low like it would be for a warm engine?
I already cleaned the MAF, replaced fuel filter + spark plugs. Temp display is fine otherwise, but I'll try replacing the sensor next.
When it was working fine, rpms would go higher in the first minute after a cold start, bu it no longer does that. Almost like a missing "choke" - or whatever the equivalent is for these engines.
Do you know what controls the rpm increase for a cold engine? What could cause them to stay low like it would be for a warm engine?
I already cleaned the MAF, replaced fuel filter + spark plugs. Temp display is fine otherwise, but I'll try replacing the sensor next.
#2
On the first start of the day mine idles low as well. Any other cold start (but not the first start in a long period of time such as an overnight) it will idle high, as it should, for about a minute.
No clue what this is all about either...
No clue what this is all about either...
#4
Does the idle surge?
What is a "high" idle for you?
Cold start mine will be about 850 all day long. Warm start again,850. My coolant temp gauge is shot and no starting problems.
I would definitely check the sensor governing the intake air temp and maybe check 02's? Could be something simple, could be...lol
Another thing to check are vacuum lines!!!
What is a "high" idle for you?
Cold start mine will be about 850 all day long. Warm start again,850. My coolant temp gauge is shot and no starting problems.
I would definitely check the sensor governing the intake air temp and maybe check 02's? Could be something simple, could be...lol
Another thing to check are vacuum lines!!!
Thread
Thread Starter
Forum
Replies
Last Post