|
700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
Information |
|
Odd occasional hesitation under acceleration/boostViews : 1848 Replies : 36Users Viewing This Thread : |
|
Thread Tools | Display Modes |
Jan 17th, 2020, 01:17 | #31 | |
Ye olde Volvii galore!
Last Online: Dec 18th, 2023 11:23
Join Date: Oct 2017
Location: Sherborne
|
Quote:
__________________
Barges of Distinction: '96 945 SE LPT M90 '95 945 GLE D24TIC M90 ‘88 745 GL B200E M47 |
|
The Following User Says Thank You to AllHailKingVolvo For This Useful Post: |
Jan 17th, 2020, 09:13 | #32 |
Ye olde Volvii galore!
Last Online: Dec 18th, 2023 11:23
Join Date: Oct 2017
Location: Sherborne
|
It appears that we have something of a breakthrough! I took the 940 on the school run this morning (mainly to give the injector cleaner a chance to work through the system), and with the fuel filter change and Forte in the tank, it feels much improved.
There is still a slight unevenness under heavy load but nothing out of the ordinary compared to my other Redblocks. The car has plenty of power on tap and throttle response is much improved. I think with the new CTS, CPS and possibly a new Lambda sensor at some point soon, it will be as close to perfect as its going to get. Knowing the relative shortcomings of the ignition system, it makes me tempted at some point in the future to try out a wasted spark conversion. I do quite a few miles, and the proposed MPG gains would pay for the system within a year, plus smoother running is always appealing!
__________________
Barges of Distinction: '96 945 SE LPT M90 '95 945 GLE D24TIC M90 ‘88 745 GL B200E M47 |
The Following User Says Thank You to AllHailKingVolvo For This Useful Post: |
Jan 17th, 2020, 11:05 | #33 |
Premier Member
Last Online: Yesterday 23:44
Join Date: May 2012
Location: Lakenheath
|
Give it a few days use for the injector cleaner to do its work Phil then pull fuse #1 for a few minutes to clear any fuel trims learned from the clogged injectors time.
Also when you replace the CTS pull it after as well, likewise if/when you change the Lambda. Great you seem to have some progress on it!
__________________
Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
The Following User Says Thank You to Laird Scooby For This Useful Post: |
Jan 18th, 2020, 15:43 | #34 | |
Ye olde Volvii galore!
Last Online: Dec 18th, 2023 11:23
Join Date: Oct 2017
Location: Sherborne
|
Quote:
__________________
Barges of Distinction: '96 945 SE LPT M90 '95 945 GLE D24TIC M90 ‘88 745 GL B200E M47 |
|
The Following User Says Thank You to AllHailKingVolvo For This Useful Post: |
Jan 20th, 2020, 07:25 | #35 |
Ye olde Volvii galore!
Last Online: Dec 18th, 2023 11:23
Join Date: Oct 2017
Location: Sherborne
|
Hmm...took the car on a good run yesterday (a 2hr round trip) to work and back, and whilst it generally drove well on the way there, the misfire/flat spot had returned noticeably on the way home. However, it seemed to come and go periodically which seemed odd.
Yesterday on the car I changed the CPS and cleaned all earth strap connections all round. It ran fine when tested afterwards and generally well on the journey to my gig, it was the trip home (temperature much colder and more damp than the journey there). I'm wondering if initially, the more free-flowing fuel filter increased fuel pressure which richened the mixture, but subsequently, if the CTS is off, the ECU has leaned out the fuel trims again as it's "learned" the new fuel flow rate etc. I'm also suspicious of the Bosch HT leads I fitted, the boots on the king lead and cap end aren't as long and nicely fitted as the ones that came off, which themselves were cheap leads...so I bit the bullet and ordered a set of Bougicord units. I've read some negative comments about Bosch leads so figured going OEM would probably be best. The hunt goes on...I'm determined to get to the bottom of this!
__________________
Barges of Distinction: '96 945 SE LPT M90 '95 945 GLE D24TIC M90 ‘88 745 GL B200E M47 |
The Following User Says Thank You to AllHailKingVolvo For This Useful Post: |
Jan 20th, 2020, 08:53 | #36 |
Premier Member
Last Online: Yesterday 23:44
Join Date: May 2012
Location: Lakenheath
|
See if you can work out a pattern as to when the misfire/flat-spot appears Phil and once you have, see if you can recreate it by simulating the circumstances around it, that will help enormously towards hopefully finding the cause.
__________________
Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
The Following User Says Thank You to Laird Scooby For This Useful Post: |
Jan 20th, 2020, 13:21 | #37 | |
Ye olde Volvii galore!
Last Online: Dec 18th, 2023 11:23
Join Date: Oct 2017
Location: Sherborne
|
Quote:
It wasn't blue in any way, so it isn't burning oil, but it looked to me like it was the symptoms of running a bit rich...quite the opposite problem to what the plugs seemed to indicate at the last change! I'm going to keep an eye on it, new CTS arrives tomorrow and Bougicord leads the day following, so will see how they fare.
__________________
Barges of Distinction: '96 945 SE LPT M90 '95 945 GLE D24TIC M90 ‘88 745 GL B200E M47 |
|
The Following User Says Thank You to AllHailKingVolvo For This Useful Post: |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
|
|