1.6L 147 won't start from warm! - Alfa Romeo Forum
You are currently unregistered, register for more features.    
Thread Tools Search this Thread
(Post Link) post #1 of 8 Old 10-10-09 Thread Starter
Status: -
AO Member
Join Date: Oct 2006
Location: Loughborough
Posts: 14
1.6L 147 won't start from warm!

Picture the scene...

I've driven 80+ miles to a hotel to pick up some family members for a wedding at which I'm meant to be the main photographer. After a 10 minute wait (while the ladies get their hats together) we pile into my 147 to go to the ceremony. I turn the key and the starter motor turns the engine over but it just won't fire. I try again. And again. And again...

Cue panic and assorted death threats from relatives of the bride-to-be. I put the bonnet up while they shout obscenities at me.

Anyway, we pile into two taxi's (extra vehicle needed cos I'm a passenger now) and the good name of Alfa is besmirched by all and sundry. We eventually make the wedding on time, but only by sprinting past the bride as she walks up the pathway into the church.

After the ceremony, I sneak back to the hotel and give it one last try. She starts first time. I drive back to party and turn her off in the carpark. Just for peace of mind, I try to restart her. She won't start again.

Anyway, sounds remarkably similar to this:
Alfa Romeo Repair: alfa romeo 147 intermittent starting problem, alfa romeo 147, alfa romeo

but wondering if any forum members had had or heard about anything similar...


2002 1.6L Alfa 147
P.S. I did notice that the battery level indicator is white (not green as it should be), but the starter motor is turning over normally. Could a new battery be the fix or have I got multiple issues...
ttpas is offline  
Sponsored Links
Status: -
AO Platinum Member
David C's Avatar
Join Date: Aug 2003
Location: London, England
Posts: 28,991
Probably crank sensor.
David C is offline  
Status: No remission for LUFC !!
AO Silver Member
ronan's Avatar
Join Date: Aug 2009
Location: Belfast
County: Down
Posts: 3,043

Member car:

156 1.8 Turismo

Classic crank sensor problem.
ronan is offline  
Status: Banned for not following the site rules
Join Date: Feb 2008
Location: United Kingdom
County: Wiltshire
Posts: 9,721
Images: 6
Crank sensor £35.
Smaky is offline  
(Post Link) post #5 of 8 Old 11-10-09 Thread Starter
Status: -
AO Member
Join Date: Oct 2006
Location: Loughborough
Posts: 14
Seems pretty conclusive. There are a few threads on changing the sensor so I'll have a go and report back if it cures the problem.

Thanks for your help - Much, much appreciated

ttpas is offline  
(Post Link) post #6 of 8 Old 18-10-09 Thread Starter
Status: -
AO Member
Join Date: Oct 2006
Location: Loughborough
Posts: 14

Changing the engine rpm sensor cured it. £35 for the part from Alfa dealership in Northampton. For the benefit of anyone with a similar problem, here's how I replaced the sensor.

Vehicle: 2002 1.6L Alfa 147 (103HP version)

1. Buy the elearn workshop manual of Ebay!!! My copy cost £2.99
2. Disconnect the Battery negative, and the electrical connections for the lambda sensor and rpm sensor (white and orange clips respectively) near the injectors.
3. Remove the heatshielding that covers the exhaust manifold and catalyst (4 bolts)
4. Disconnect the 2 electrical connections for the lambda sensors in the catalysts
5. Split the exhaust system at the point just upstream of the main silencer by removing the 2 bolts holding the exhaust together and the 2 bolts holding the exhaust to the chassis.
6. Unhook the downstream lambda sensor cable from the chassis (enough that the exhaust can reach the floor without the cable taking any weight
7. Remove the bolt for the remaining flexible mount on the upstream section of the exhaust
remove the long horizontal bolt holding the catalysts to the lower part of the crankcase.
8. Remove the 5 bolts (3 from above, 2 from below) holding the catalysts to the exhaust manifold)
9. Gently lower the catalysts and the front half of the entire exhaust away from the vehicle
10. Reach up behind the sump into the gap you've just created to remove the single bolt holding the black plastic rpm sensor into the crankcase (Allen key head)
11. Remove the rpm sensor making sure to remove the rubber o-ring that will probably get stuck in the recess.
12. Lubricate the the new rpm sensor with some clean oil and refit using the allen headed bolt.
13. Take the old sensor cables out of the clips leading it to the top of the engine and feed the new sensor cable through these clips instead
13. Refit: the catalyst (5 bolts), the long horizontal bolt, the first flexible mount, the second flexible mount and the two sections of the exhaust. Restrap the downstream lambda sensor cable through its clips so its not hanging down.
13. Reconnect the electrical connections for the lambda sensors (3) and the rpm sensor.
14. Bolt the heat shielding back over the catalyst.
15. Reconnect the battery

Took me (a rookie!) about two hours to do this. Probably takes about half that if you had done it before.

Thanks to Smaky, Ronan and David C for the diagnosis. Much appreciated.
ttpas is offline  
Status: -
AO Member
Join Date: Aug 2005
Location: United Kingdom
County: Cornwall
Posts: 20

Member car:

AR 146 1.6

Had a similar problem...

Thought i'd give more details.

1). Always start from a cold start - sometimes the engine management light comes on other times it wouldn't.

2). Engine would cut out when driving, as temperature got higher than 90 degrees (this is an extreme case) but then would start when it has cooled down.

part was 35 quid, a local mechanic fitted it in for a tenner.
apple is offline  
Status: -
Join Date: May 2008
Posts: 6

Member car:

ALFA 147

Thanks for this post!

Just a note to say thanks for the walkthrough - had exactly the same problem and
got the part from my local Alfa dealer (Aylsford) (£40 now!)
Took about two hours with my bro - it's a fiddly job and hard to get to - but it did the job !
SMARTY65000 is offline  

Go Back   Alfa Romeo Forum > Supported Alfa Romeo Models > Technical & Vehicle Assistance > Alfa 147, 156 & GT

147 , 16l , start , warm

Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

For the best viewing experience please update your browser to Google Chrome