Ye 'Ol cold start thread

[ORCoaster]

I say combo between poor compression when cold and a poor fueling issue at startup if allowed to set overnight.  Some where fuel is leaking back and enough air is coming in to make it difficult to start.  Just fix up the other engine and get rid of this problem one.

DAS

[8v-of-fury]

Clear fuel lines, no air.. must be just stupid poor compression. I hope it is not pump related! I will be using the current pump as my base for the m-tdi pump. It is a 1.6 TD body with a N/A lid on it

Just soaking the tdi pump and bracket in penetrating fluid.. i swear it has NEVER been off the engine.. or moved for that matter.

[Mark(The Miser)UK]

8V, I'd just like to apologise for my strange posting earlier. I've been up too late, ie 3am, [I've been telling myself that I don't need more than 4 hours sleep.] Clearly I do.  
Although a similar topic, we'll just call it wrong thread and wrong forum . I won't be erasing, as it messes with continuity and is a monument to human error...
 
In my defense, you did mention bluish smoke, so my valve stem seal comment holds .

Have you tried a little more on the max fuel screw?

[carrizog60]

might be the opening in the plunger that doesent get uncouvered enough like mark just said...

[8v-of-fury]

Would this problem not have presented itself when it were warm out as well though Carrizog?

Pump was not dismantled that far while in my posession, and I have probably close to 12,000km on it since i put it on the car in May.

[R.O.R-2.0]

Would this problem not have presented itself when it were warm out as well though Carrizog?

Pump was not dismantled that far while in my posession, and I have probably close to 12,000km on it since i put it on the car in May.

my audi had like ~200 some odd psi compression, and it would start fine in the summer..

once winter hit, it didnt matter how much ether you used, it wouldnt run..

[R.O.R-2.0]

and uh, my car has had a bit of a clod start issue too..

you have to give it throttle to get it to fire up cold.. it wont start without flooring it.

im beginning to think that my timing is retarded.. i dont have any air leaks in the fuel system anymore, im fairly confident that i fixed that part of my problems..

when i fire it up, i glow for 10 seconds, then hit the key and it stumbles and misses for roughly 5 seconds, then clears up and runs fine..

it sounds like it fires up on 2-3 cylinders, and if you crank enough without hitting the throttle, eventually it will start up and idle ROUGH.

it POURS SMOKE when its stumbling and missing.. then the smoke clears up, and it runs just like nothing is wrong.. it pours grey smoke, not white, when you fire it up cold..

once it has the SLIGHTEST amount of heat built up, it fires up fine tho..

never had any starting issues while this engine was still in my rabbit, but then i had to pull the pump, and change the bracket. dont have a pump timing indicator..

thinking its my timing, what do you guys think?

[Mark(The Miser)UK]

Slacken mounting bolts for pump, and start her up whilst cold.
Adjust timing of pump during this misfire period.
Increase revs if neccessarywhilst doing this to keep her running.
If there is no sweet spot/region, then get a different set of injectors. Rerun test.
Still no good, then change pump. Rerun test

Test has to be done whilst problem occurring...

[ORCoaster]

Mark,  Hillbilly tuning 101 eh?

[R.O.R-2.0]

Slacken mounting bolts for pump, and start her up whilst cold.
Adjust timing of pump during this misfire period.
Increase revs if neccessarywhilst doing this to keep her running.
If there is no sweet spot/region, then get a different set of injectors. Rerun test.
Still no good, then change pump. Rerun test

Test has to be done whilst problem occurring...

it wont run on its own while its running crappy.. and it only runs crappy for about 5 seconds, then smooths out.

i dont see how it could be an injector problem.. i had this engine running PEFRECT in my mk1..

i could glow the plugs for 8 seconds, pull the advance, and fire it right up.. no throttle at all.

[ORCoaster]

Then to use Mark's method you best be fast.  Not just good.

[Mark(The Miser)UK]

Slacken mounting bolts for pump, and start her up whilst cold.
Adjust timing of pump during this misfire period.
Increase revs if neccessarywhilst doing this to keep her running.
If there is no sweet spot/region, then get a different set of injectors. Rerun test.
Still no good, then change pump. Rerun test

Test has to be done whilst problem occurring...

it wont run on its own while its running crappy.. and it only runs crappy for about 5 seconds, then smooths out.

i dont see how it could be an injector problem.. i had this engine running PEFRECT in my mk1..

i couldglow the plugs for 8 seconds, pull the advance, and fire it right up.. no throttle at all.

Well... There are fellow members who'd love 5 seconds of crappy ness, in exchange for their 60 seconds plus

Injectors that misbehave when cold only are commonplace.
It can be crud, but quite likely physical distortion of the nozzle holder from overtightening at some stage. Upon dissembly, burnish patches can sometimes be seen on the needle's shaft.

My research informs me that rotating needles in their nozzles once run-in during servicing can lead to temporary degradation of operation again for a while.The finer the quality of the nozzle the more suseptable.

You could do a pop test at the start of the day, as that may show it up, as 5 seconds equates to some 50+ operations to 'free itself, if it is an injector issue...

[BillyWillicker]

Plz chk cmprssn, report yer findings too!  Others may have a similar problem and the info would be helpful.

[8v-of-fury]

BW FRIG OK! lol

I will pull the injectors, do a comp test, and then replace with different injectors depending on my findings.

[ORCoaster]

All this for 5 seconds of crappiness?  You have to be kidding!