Cold start problems


thanks tama666 a faulty coolant temp sensor seems like the logical explanation from what i can see so i will replace that and go from there.
 
ok i looked today and ive ruled out the following:
-throttle body/choke
-IACV
-distributor cap
-plugs/leads
-coolant temp sensor and other sensors in the head
checked again and definately no CEL codes stored

pretty stumped now so any more input would be appreciated.

.
 
the whole distributor not just the cap, the whole unit. Swap that over also...and did you get the compression test done yet?
twincamtech_2148_165239763
 
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i tried taking the whole distributor off but the top bolt wouldnt move, cant get a socket onto it because of its position and the spanner just rounded the corners of it. might take the grinder to it later. no i havent a compression test done yet i wanted to try some stuff that wouldnt cost any money first.

tama- i found one coolant temperature sensor on the head which looks like this and is located just below the distributor, it seems to be fine. is this the one that goes to the ecu or dash and where is the other one located?
images
 
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hi lad it could be a lamda sensor, that adjusts the fuel.
it would be worth taken out the fuel pump and have a look at it..
sometime if ur not sure that it to someone..
 
cheers eamon ill check that,
i found the other coolant temp sensor on the thermostat housing but when i unplugged it it didnt even throw up a fault code. but any other sensor i unplugged it gave me a CEL fault code. what would that mean?
im going to get a compression test done next weekend and after that im pretty stuck.
 
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i found the other coolant sensor and changed both over but didnt work. i havent changed main relay ill try that too and distributor and compression test.
cheers that link is useful ill work through them all when i get back home.
 
...i bet its the dam distributor. I have 2 back up distributors on hand for this very reason.
 
abunai888 said:
sorry for interfear:nerv:
but tama666 your fuel pressure marks look higher than mine are you using oem fuel pump ?
my car runs at 40psi at idle 50 at wot
Click to expand...

abunai888, good eyes.

There was a whole process I went through to arrive at this dial reading which will, I hope, answer your PSI and fuel pump question.

I needed to replace the OEM fuel pump and I also installed the gauge, FPR and a new fuel filter at the same time. First I swapped out the fuel filter with the existing OEM fuel pump still in place. At the same time, I installed the fuel gauge on top of the new fuel filter. I started the car with the OEM fuel pump in place and marked the PSI at idle and WOT, as seen by the silver dots on the fuel pressure gauge--this is the OEM fuel PSI as it relates specifically to this one gauge. I did this process because I never trust a gauge right out of a box. So as you can see the new gauge is a bit off in its reading. Once OEM PSI was reached on the new gauge, I then installed the new 255 fuel pump and FPR; set the PSI back to stock [silver dots]. DONE! :)

But off topic, we need to get this guys car running!
 
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thank you sir :thanks:
i have a b&m gauge i wont trust it when i swap my fuel pump for walbro 190lph :))

about original thread maybe iacv pushing idle that low that car stops ??
sorry i havent read the whole thread yet :nerv:
 
jackhdc2 said:
anyone any more ideas?
the car is running 100% when the engines warm, starts first turn of the key.
but when the engine is cold it wont start. when i turn the key it turns the engine over quickly but will not fire up.
it will start with a push and ticks over ok but if i put the accelerator down quickly it tries to cut out.
ive checked and there are no CEL codes stored. im going to try and get the lend of a distributor to rule that out at the weekend. and after that i dont know what to do.
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:(( When you push accelerator down, throttle is wide open --> more air to the cylinders.
So is engine having enough fuel to make the Suitable mixture ?
Too much air +less fuel -->to lean mixture+ cold cylinders --> engine wont start!
Maybe your ECU when your engine is cold run lean!? why?
Maybe is not getting proper signals from some sensors!?
I would say air temp sensor or vacuum line to map sensor!?
Have you lately measure gases? From gas measurements you can see how good your engine runs even when its gold or hot!
You may need regulate your valves, you may also try another lamda sensor!:)
 
KOUVPASIR said:
:(( When you push accelerator down, throttle is wide open --> more air to the cylinders.
So is engine having enough fuel to make the Suitable mixture ?
Too much air +less fuel -->to lean mixture+ cold cylinders --> engine wont start!
Maybe your ECU when your engine is cold run lean!? why?
Maybe is not getting proper signals from some sensors!?
I would say air temp sensor or vacuum line to map sensor!?
Have you lately measure gases? From gas measurements you can see how good your engine runs even when its gold or hot!
You may need regulate your valves, you may also try another lamda sensor!:)
Click to expand...

KOUVPASIR
:nice:
 
KOUVPASIR said:
:(( When you push accelerator down, throttle is wide open --> more air to the cylinders.
So is engine having enough fuel to make the Suitable mixture ?
Too much air +less fuel -->to lean mixture+ cold cylinders --> engine wont start!
Maybe your ECU when your engine is cold run lean!? why?
Maybe is not getting proper signals from some sensors!?
I would say air temp sensor or vacuum line to map sensor!?
Have you lately measure gases? From gas measurements you can see how good your engine runs even when its gold or hot!
You may need regulate your valves, you may also try another lamda sensor!:)
Click to expand...

thanks for your help. but from what i could tell i would have thought its running rich when cold if anything. because it seems to be flooding the sparkplugs when i turn the engine over.
and it is not throwing up any CEL codes so i dont think it is a faulty sensor, though i will try those sensors just incase. do you know where abouts are those sensors located on the engine? thanks
 
jackhdc2 said:
thanks for your help. but from what i could tell i would have thought its running rich when cold if anything. because it seems to be flooding the sparkplugs when i turn the engine over.
and it is not throwing up any CEL codes so i dont think it is a faulty sensor, though i will try those sensors just incase. do you know where abouts are those sensors located on the engine? thanks
Click to expand...

Primary oxygen sensor or lamda sensor is just before catalytic converter.
Map sensor its on throtle body.
Did you check your ignition timing?
What did you meen by when you turn over the engine sparkplugs flooding? You might meen that engine dont stop imedietly? but when engine is cold or hot?
 
ok, it isnt the map sensor as i swapped over the whole throttle body. i havent checked the ignition timing no.
well when i try to start the car from cold it turns over a few times, then if i take the spark plugs out they are covered in petrol. si i thought it might be overfuelling.
 
thanks again tama i think you mentioned that before lol im not with the car during the week but ill be home tomorrow so will get a good look at it. first thing ill do is swap the distributors, as i said before i was having trouble removing it as the bolt was rounded and its in an awkward place but ill get it off somehow. ill update you when i try that. cheers.
 
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