Engine 850: B5234T/2.3/20v/T5: Starting issue

[stuartvolvo]

Hi guys,
Sice i got my car back after the engine was replaced, at times she seems to take a while turning over before she comes to life. It does not matter if it is hot or cold, weather she has been run for 2 sec or 5 hours. It just seems to take time to fire up. I have replaced the coil, distributor cap, leads, spark plugs and she has had a full service. When she is running, she runs like she is still just out the show room. No low or high revs, no hessitation, no nothing. All it is is the time it can take to start at times. Sometimes 2 turns of the key.

Does anybody have any ideas.

[stuartvolvo]

I have just has a thought while i have been brousing through the forum. I know the car started fine on the previous engine so that is why i am thinking that the problem is from the new engine its self. As i said before i have replaced the electrical side of things, apart from the cam sensor or possition sensor as i think it might be called. It is still the original sensor that is on the engine, and i kept the one that i had on my last engine, so i might give it a go and swap them about and see if that makes any difference.

What do you guys think?

[stuartvolvo]

Does anybody have any other ideas as to what it could be apart from the position sensor. I will change that later on today.

[stuartvolvo]

I have just replaced the position sensor and been out for a good run. Unfortunatley it is just the same, and has the intermittant long cranking time. Does anybody else have any idea at all.

[Jod T5]

stuart, have you checked the timing belt has been fitted correctly, if your exhaust cam is a little out this could lead to the fuel being dumped before the spark requiring a long crank to build up enough gas to ignite....
you may also want to consider whether or not the pressure regulator is operating correctly and is not stuck open allowing fuel to return to the tank..
other options could be incorrect plugs or low compression
cheers
jod

[stuartvolvo]

Hi Jod. Thanks alot for your reply. I have been pulling my hair out. I have also just finished replacing the fuel filter there, as it was something else that was needing done. I know that the correct plugs are in it. I am pritty sure that the timing belt has been done correctly although i will check upon this. Where do i find this pressure regulator that you speak of. As yet, this is not a part that i have worked on, so this will be a first. If you could tell me exactly where it is and how to check it i would greatly appreciate it.

[don0412]

if mine dont start i wait at least 30 secs before i try again any time ive tried immediatley after it wont go but short delay always does trick for me

[pookie]

FWIW the ECU does NOT trigger the coil. The ignition amplfier does this, has it been checked or substituted?

Pookie

[stuartvolvo]

Yeh Pookie, i thought that. From what i have found out the ecu does not really controll anything to do with the starting. It is more for the running of the car.
Where exactly is the ignition amplifier. Could you please describe it to me and where i would find it.
Thanks

[Sprintman]

Hi all,

just read the end of this thread, not all the 143 replies, but I thought I would relate a recent experience with a 2 litre 20 valve which may be of help. It seemed to start and run OK from cold but once it got hot after about 4 miles would cough and splutter, eventually stalling and would not restart until being left to cool for some time. Had it on the diagnostics, nothing found wrong so was very puzzled as to what the problem might be. Tried another coil but this didn't cure it. Eventually reasoned that if there was nothing wrong with any of the sensors then the cause must be something that is not sensed by the diagnostics, so tried a new distributor cap, rotor arm and plug leads, and lo and behold it runs perfectly! I wouldn't have thought these simple things would make that much difference but they obviously do, and so they're something worth trying if all else fails!