home register FAQ memberlist calendar

Go Back   Turbobricks Forums > Mechanical > maintenance & nonperformance

Reply
 
Thread Tools Display Modes
Old 04-20-2021, 01:04 PM   #1
PaulBorsan
Newbie
 
Join Date: Oct 2020
Default Volvo 960 2.0T 16v b204ft Issues

Hey guys, this is my first time posting on a car related forum, so please, go easy on me haha

I bought my first Volvo on October 2020, with only 90k km and in really good shape, and since then Im reading here to find help with my issues.

The problem is that the car feels really low on power, 1st & 2nd gear are good, but when Im either on 3rd 4th or 5th(M46), while foot to the floor, it hesitates a lot, its like Im not accelerating at all and after some secs power comes back again, usually happens more when going slightly uphill.
The consume is super high, I got 13L/100 doing 80-100 on highway.

Could it be that because the car was barely driven in the past, it drives so poor now?

The previous owner, one week before selling it to me changed all the filters and oils + timing belt(with 70k km).

I changed the sparkplugs (gap as I rode on the Volvo manual) and wires. Cleaned MAF sensor and throttle body. The hose that connects to the TB had some oil in it (is it normal?).

Today I checked the OBD and I got the following codes:

Fuel injection 3-4-4 & 1-2-1
TCU 4-2-3

Can you guys help me with this to get in the right direction?

Thanks in advance for your help and sorry for my lack of car knowledge, Im really new to this world.

EDIT: Idle stays usually high, between 1-1.5k rpm
Also, checked the injectors resistance and I got 2,7ohms on each one of them

Last edited by PaulBorsan; 04-20-2021 at 01:18 PM..
PaulBorsan is offline   Reply With Quote
Old 04-20-2021, 04:35 PM   #2
dl242gt
Happy playing the blues
 
dl242gt's Avatar
 
Join Date: Jun 2002
Location: S NJ, a suburb of Phila.
Default

My first suggestion would be to try to find some green book service manuals for your car. It's such a rare setup that it will help you a lot of have that information. It's usually for sale on ebay or many manuals are still available from Volvo.

I'd suggest checking the intank fuel pump as the problem happens when you have a high load on the engine. Try clearing the codes and see which ones come back. The oil in the hoses is normal. It's from the pcv system which dumps oily good into the intake. It's a good idea to take out the intercooler and drain the accumulation and also service the hoses and separator box of the pcv system. Check your engine over carefully for any cracked and damaged hoses. A vacuum leak aka intake leak can cause hesitation and also check the intake hose for the turbo to make sure it's not collapsing when you make boost.
__________________
Dave,
1982 242 turbo. 338k miles. MVP coilovers and 3" exhaust. Flowed 405 with a V15. Cossie turbine housing with upgraded compressor housing. 90+, IPD remote oil filter. Some other goodness, too. Been lots of fun over 25 years. Restored in 2k. Now ready for a 2nd restoration.

1993 245 Classic, 430k miles, enem V15. IPD bars and chassis braces. Simons sport exhaust from Scandix. sbabbs ezk chip. Been a good road warrior. Genuine Volvo rebuilt leaky M47.
dl242gt is offline   Reply With Quote
Old 04-21-2021, 02:22 PM   #3
Janspeed
Board Member
 
Join Date: Sep 2005
Default

3-4-4 EGT temperature signal absent or faulty << your car probably has a broken exhaust gas temperature sensor. It's located on the back of the exhaust manifold. Unfortunately this sensor is expensive and almost unobtanium... the TCM (turbo control module) needs this sensor input to regulate boost. If it does not get a good signal it will only allow mechanical spring/gate pressure and it will instruct the injection to add more fuel for safety which would explain the lacklustre performance and high fuel usage
If you want proper boost (max 18psi or so) maybe consider ignoring the TCU and installing an aftermarket (stand alone) electronic boostcontroller (like from Apexi or TurboSmart or Greddy, etc )
4-2-3 Throttle position sensor. Signal faulty. << this could be caused by bad adjustment or it could actually be broken
1-2-2 Faulty signal to/from Air Mass Meter << speaks for itself
Janspeed is offline   Reply With Quote
Old 04-22-2021, 10:03 AM   #4
PaulBorsan
Newbie
 
Join Date: Oct 2020
Default

Quote:
Originally Posted by dl242gt View Post
My first suggestion would be to try to find some green book service manuals for your car. It's such a rare setup that it will help you a lot of have that information. It's usually for sale on ebay or many manuals are still available from Volvo.

I'd suggest checking the intank fuel pump as the problem happens when you have a high load on the engine. Try clearing the codes and see which ones come back. The oil in the hoses is normal. It's from the pcv system which dumps oily good into the intake. It's a good idea to take out the intercooler and drain the accumulation and also service the hoses and separator box of the pcv system. Check your engine over carefully for any cracked and damaged hoses. A vacuum leak aka intake leak can cause hesitation and also check the intake hose for the turbo to make sure it's not collapsing when you make boost.
I found some books and manuals online, like The Gothenburg Bible/The Volvo Performance Handbook, but theres not much about B204FT, anyways still usefull info that helps me learn more.

I erased the codes but they all come back. I will check for leaks and try to service the pcv and intercooler this weekend.

Thanks for the advices! 👊🏼
PaulBorsan is offline   Reply With Quote
Old 04-22-2021, 10:23 AM   #5
PaulBorsan
Newbie
 
Join Date: Oct 2020
Default

Quote:
Originally Posted by Janspeed View Post
3-4-4 EGT temperature signal absent or faulty << your car probably has a broken exhaust gas temperature sensor. It's located on the back of the exhaust manifold. Unfortunately this sensor is expensive and almost unobtanium... the TCM (turbo control module) needs this sensor input to regulate boost. If it does not get a good signal it will only allow mechanical spring/gate pressure and it will instruct the injection to add more fuel for safety which would explain the lacklustre performance and high fuel usage
If you want proper boost (max 18psi or so) maybe consider ignoring the TCU and installing an aftermarket (stand alone) electronic boostcontroller (like from Apexi or TurboSmart or Greddy, etc )
4-2-3 Throttle position sensor. Signal faulty. << this could be caused by bad adjustment or it could actually be broken
1-2-2 Faulty signal to/from Air Mass Meter << speaks for itself
Is there a way to test that the EGT sensor is dead? I would consider ignoring the TCU(https://forums.tbforums.com/showthread.php?t=349043) and installing a boostcontroller, but Im really amateur and this job looks really tough for my skills.

Please explain “speak for itself”. That means it has something to do with EGT?
Replacing the MAF sensor could be the fix for the 1-2-1?
PaulBorsan is offline   Reply With Quote
Old 04-22-2021, 10:29 AM   #6
ZVOLV
<Master Tech>
 
ZVOLV's Avatar
 
Join Date: Nov 2002
Location: California
Default

If I had it at the shop, I'd smoke test it and find all the air leaks.

Inspect the MAF terminals for corrosion.
__________________
No Start Thread
ZVOLV is offline   Reply With Quote
Old 04-28-2021, 05:26 AM   #7
Janspeed
Board Member
 
Join Date: Sep 2005
Default

Quote:
Originally Posted by PaulBorsan View Post
Please explain “speak for itself”. That means it has something to do with EGT?
Replacing the MAF sensor could be the fix for the 1-2-1?
No. it means that the code discription is pointing directly to what is wrong with the AMM. It's either broken or not delivering a proper signal due to some issue like contact corrosionor maybe there is a wiring issue to the AMM.
Janspeed is offline   Reply With Quote
Old 04-28-2021, 09:17 AM   #8
tomasss
former PRVert
 
tomasss's Avatar
 
Join Date: Oct 2008
Location: Leuven, Belgium
Default

How is the o2 sensor? When it was bad on my b204gt, it was also drinking the gas excessively and the performance was low.
For the idle...might be some leak. Try to pressurize the intake as suggested above.
__________________
Volvo 740 Turbo B204GT 1991 >project thread<
It's the oversteer that scares passengers. It's the understeer that scares the driver.
Quote:
Originally Posted by Wren View Post
I would rather push a 240 than drive a V70.
lazy PRV engine? Check >this< out
tomasss is offline   Reply With Quote
Old 05-01-2021, 07:26 AM   #9
PaulBorsan
Newbie
 
Join Date: Oct 2020
Default

Cleaned the terminals of the MAF, TPS and O2 sensor (also changed it with a new one). Deletee the codes and the only one that still pops up is the 344. Car still hesitates on full load, when Im 50% throttle it feels lot smoother.

Gonna make a smoke test ASAP, but I already can see a leak on the exhaust manifold.

Thanks for your help guys, will keep you updated!
PaulBorsan is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -4. The time now is 10:45 PM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.