1990 Volvo 240 rough Idle on start
#1
1990 Volvo 240 rough Idle on start
Hello All,
I am hoping to find some help here about an issue I am having with my 1990 240 DL.
The car will idle rough when you first start it, it seems to be worse the colder it gets. After running the car for a few minutes, the idle gets better but if I try to drive the car right away it will stall. Here are the parts I replaced hoping to fix the issue:
1- New NGK spark plugs
2 - New Bosch Oxygen sensor
3- New Temp sensor (FCP EURO)
4 - Idle control switch (Aftermarket)
5 - New injectors (Refurbished and tested)
6 - New Alternator and Battery (The old one wasn’t charging)
7 - My mechanic checked the cold start injector and engine compression and says it is good.
8 - New MAF by Delphi
9 - Checked for vacuum leaks with a smoke machine and found one leak which is now fixed.
My mechanic also checked the fuel pressure and says that is fine, I want to check that myself since the only thing left for me to replace is the fuel pump.
I am hoping to find some help here about an issue I am having with my 1990 240 DL.
The car will idle rough when you first start it, it seems to be worse the colder it gets. After running the car for a few minutes, the idle gets better but if I try to drive the car right away it will stall. Here are the parts I replaced hoping to fix the issue:
1- New NGK spark plugs
2 - New Bosch Oxygen sensor
3- New Temp sensor (FCP EURO)
4 - Idle control switch (Aftermarket)
5 - New injectors (Refurbished and tested)
6 - New Alternator and Battery (The old one wasn’t charging)
7 - My mechanic checked the cold start injector and engine compression and says it is good.
8 - New MAF by Delphi
9 - Checked for vacuum leaks with a smoke machine and found one leak which is now fixed.
My mechanic also checked the fuel pressure and says that is fine, I want to check that myself since the only thing left for me to replace is the fuel pump.
Last edited by novaSweedBrick; 08-18-2020 at 01:49 PM.
#3
Thanks, @silvermine - That was checked by my mechanic, he said it was good but yes, maybe I should replace itit. How can I tell if the old one needs replacing?
#4
was the idle air control valve cleaned and tested? when you remove them, you should have a pair of new IAC hoses on hand because the old ones likely will crack. you clean it with throttle body cleaner spray, then test it by repeatedly applying 12V to the pins, and verifying that it opens/closes briskly and without sticking.
also verify that the 'new' idle throttle switch actually opens/closes with the throttle, by using a ohm (or continuity) meter
also verify that the 'new' idle throttle switch actually opens/closes with the throttle, by using a ohm (or continuity) meter
#5
Thanks, @silvermine - That was checked by my mechanic, he said it was good but yes, maybe I should replace itit. How can I tell if the old one needs replacing?
if the contacts at the top of the underside of the cap are
corroded, the cap has hairline cracks, and or if the rotor shows wear or burned marks on it
here is an example of a badly burned rotor that came from my car, and the engine still ran!!
https://volvoforums.com/g/picture/7897572
Last edited by silvermine; 08-19-2020 at 05:39 AM.
#6
#7
if the contacts at the top of the underside of the cap are
corroded, the cap has hairline cracks, and or if the rotor shows wear or burned marks on it
here is an example of a badly burned rotor that came from my car, and the engine still ran!!
https://volvoforums.com/g/picture/7897572
corroded, the cap has hairline cracks, and or if the rotor shows wear or burned marks on it
here is an example of a badly burned rotor that came from my car, and the engine still ran!!
https://volvoforums.com/g/picture/7897572
Last edited by novaSweedBrick; 08-29-2020 at 02:46 PM.
#8
was the idle air control valve cleaned and tested? when you remove them, you should have a pair of new IAC hoses on hand because the old ones likely will crack. you clean it with throttle body cleaner spray, then test it by repeatedly applying 12V to the pins, and verifying that it opens/closes briskly and without sticking.
also verify that the 'new' idle throttle switch actually opens/closes with the throttle, by using a ohm (or continuity) meter
also verify that the 'new' idle throttle switch actually opens/closes with the throttle, by using a ohm (or continuity) meter
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