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400 Series General Forum for the Volvo 440, 460 and 480 cars |
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440 B18U weak performance, bad idle and stalling.Views : 2022 Replies : 11Users Viewing This Thread : |
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Apr 14th, 2009, 08:51 | #1 |
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440 B18U weak performance, bad idle and stalling.
Hello everybpdy,
I have a volvo 440 with the B18U engine. It has done 17000 km. Last 12 months I have had problems with the car having overall weak performance, Missfiring at startup and idlespeed reving up and down 600-1100rpm. If I push the throttlepedal fast the engine will die, this is really irritating.. I suspect and airlekage since the idle stabelizes when I pump on the brakepedal once a sec.?! I have even changed the inlet/exhaust manifold gasket without any improvements. Worst job I ever done! Please somebody help me, you are my last chance |
Apr 15th, 2009, 17:29 | #2 |
Ovlovnut
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Has yours got an idle control valve? (Not familiar with B18U). If it has give this a go:
http://volvo480.dragons.org.uk/forum...ic.php?t=15569 If this fails, try testing (or simply replace) the coolant temp sensor. It is just below spark plug nearest to dizzy Good luck.
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Apr 15th, 2009, 20:39 | #3 |
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check the vacuum pipes at the rear of the manifold there are two , one goes to the manifold pressure senor near the right windscreen wiper . There should be a brass restrictor in the rubber part of this pipe near the manifold end it can block it has a 1 mm hole through it .
another cause is low fuel pressure due to a worn tank pump . there could be a problem with the throttle position potentiometer which is part of the throttle body , stored fault codes may help here ...
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Apr 16th, 2009, 08:47 | #4 |
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Thanks for the answer guys, I have electronic idle control on mine and It's changed to a new one a year a go. The temp sensor is also new.
New plugs New rotor + distributor. I have tested with new cables aswell. I do have a fault code, 4-1-1 on the tps. Looking for a new one, partnr 3437022. I have checked theese vacuum pipes and exchanged them but there was no restrictor in none of the pipes. I'm not a proffesional but It feels like an airlekage somewhere, cause when the engine gets hot the engine goes a lot better. And I can hear a sucking noise from inside the car the first sec I push on the gaspedal. Unfortunatly I can't hear this from outside How can I test the fuelpump? Thank in advance. |
Apr 16th, 2009, 12:26 | #5 |
Ovlovnut
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Tried carburettor cleaner spray. Leave it ticking over & spray around teh injector seals, inlet manifiold, see if it setlles the engine note for a short period. If yes there's your leak.
Just below the throttle body, have you got a small braided hose, about two or so inches long, joins to a thinner pipe. If yes, twist it. It may look fine but if you wiggle it you may find it has completely perished & is a major source of air leak like mine was. In the F/O/S wing 'cavity' have you got one of those carbon cannister things? If yes, that has a load of the same braided hose which can also if perished be a source of leak. Mines a 1.7 Turbo, so not sure if yours has these, but worth a check if only to rule out
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Apr 17th, 2009, 09:09 | #6 |
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I've checked theese hoses to the canister and replaced them but still no diffrence. I also checked theese hoses behind the injector unit, they are replaced. I've tested some motor starter gas around the manifold and I can sense some changes in rpm but I've alredy replaced the inlet manifold gasket I'm so tired of this ****t now.
I got a bunch of codes now: 4-1-1 1-2-2 1-2-1 1-1-3 3-1-1 I've had 4-1-1 before and I've tested the tps and I know It's bad but the other ones haven't been there before I replaced the gasket?!? I erased the codes yesterday and we'll see if they are back today.. Thanks for your help, I really appreciate It. |
Apr 17th, 2009, 12:53 | #7 |
Ovlovnut
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That does seem to be a lot of codes LOL. I hope they are 'spurious' after all your work & that the clearing codes works.
One other thought, Lamba Sensor? Have you checked that: http://volvo480.dragons.org.uk/forum...ic.php?t=14683 I changed mine even after testing. I found it had a regular pattern but not as per spec'. Got it from GSF, & it was a Bosch OEM job. Don't go for aftermarket as you need to splice in the wires & can end up introducing more snags. It can of course be done, depends if unlike me, you are a leccy whizz LOL Good Luck
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Apr 20th, 2009, 11:06 | #8 |
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Fortunatlly all codes were gone when I checked yesterday
But can a bad lambda really give theese symptoms? Anyway I will check it to so If It's OK. |
Apr 20th, 2009, 11:30 | #9 |
Ovlovnut
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I was told that it can course quite a few performance related snags.
If it is, say blacked up with carbon, for instance it'll give a duff reading to the ecu, which will then 'compensate'. In this case probably will course the car to run rich, choking up the plugs causing erratic idling, low performance & high fuel consumption. Good luck.
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Apr 23rd, 2009, 07:55 | #10 |
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the lambda seems Ok. But I'm quite sure I'ts an air leak, the question is where? As I wrote before the idle stabilises when I put my foot on the brake pedal once a second.
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