Author |
Topic: Throttle Surge (Read 552 times) |
|
pinto
Full Member
TD04 on a galaxy manifold ? whooooooosh !
 
Posts: 474
|
 |
Throttle Surge
« on: Apr 20th, 2009, 10:42pm » |
 Quote  Modify
|
Happy boy with my new cossie 
Just a question for those who own/have knowledge of the 24V (cos im learning lol) on the journey home, i noticed a gentle pulsing surge under light throttle - it dissapeared on opening her up - and a little indecisiveness with the gearing under load sometimes (she labours up hills sometimes)
She also doesnt quite seem to have the punch i'd expect over and above the 16v 2.3 that im used to - seems to be holding back on light throttle.
Im thinking MAF ?
Any advice ? 
|
|
 IP Logged |
|
|
|
Highlander
Moderator
Expert
13 Scorpios, XR4x4, Suzuki SJ413 for off road :)
Posts: 8244
|
|
Re: Throttle Surge
« Reply #1 on: Apr 20th, 2009, 10:56pm » |
Quote Modify
|
MAF for starters,
new plugs can make a big difference if its running on old broken ones.
Best bet is a scan and see what you can see.
Its amazing how many vaccum pipes etc get put back the wrong way  might be worth checking them, there is a guide on the main site i think.
I once had a look at TinTin's 24v when it wasnt running great and the last garage that had worked on it (professional car garage) had put the idle control valve on backwards!!
I was looking at the engine and knew something wasnt right but it took me a good while to realise what it was
|
|
IP Logged |
on Oct 17th, 2011, 12:35pm, Simmo wrote:I give up !  Too much for an old boy!  |
|
|
|
|
Tons_of_fun
Full Member
Mmmm...Xena !
Posts: 978
|
|
Re: Throttle Surge
« Reply #2 on: Apr 21st, 2009, 8:43am » |
Quote Modify
|
Hi Pinto. The symptoms you have just described were exactly how my cossie was a couple of weeks ago. My M A F was absolutley filthy, so after a good spraying with carb cleaner it now runs brilliantly. HTH
|
|
IP Logged |
Lord...Sometimes im not that bright
|
|
|
amigafan2003
Full Member
I'm a YaBB newbie!
Posts: 972
|
|
Re: Throttle Surge
« Reply #3 on: Apr 21st, 2009, 9:05am » |
Quote Modify
|
I did clean the MAF when I got it but that was back in Sep 2007 so maybe worth doing again? It also had new plugs and leads at the same time - some people change them every year - others dont - pull a couple out to see what they look like. I've never put injector cleaner in it though - might be worth chucking a bottle of redex through it.
Can't say I ever noticed what you are describing - in fact the y reg feels exactly the same which leads me onto my next points:-
Economy mode on the gearbox will "hold" onto gears for longer - meaning that it takes a bit more throttle than you expect to make it shift down. Sports mode will make the box shift down earlier.
Also, bear in mind the VIS "lag" on a 24v - it can feel like a flat spot.
http://www.fordscorpio.co.uk/flatspot.htm
Quote:| She also doesnt quite seem to have the punch i'd expect over and above the 16v 2.3 that im used to - seems to be holding back on light throttle. |
|
I don't think there is any difference on light throttle tbh - it's not until med throttle / WOT that the Cosworth makes it's presence felt
|
|
IP Logged |
|
|
|
pinto
Full Member
TD04 on a galaxy manifold ? whooooooosh !
Posts: 474
|
|
Re: Throttle Surge
« Reply #4 on: Apr 21st, 2009, 6:17pm » |
Quote Modify
|
Yeah, i was thinking MAF, simply because its exactly how my 2300 was acting with a dirty sensor - dose of brake cleaner and she was a lot crisper
I'll dose the MAF and see if it helps, then try the plugs and leads (the price of those arent nice tho lol )
|
|
IP Logged |
|
|
|
tonyboy
Full Member
black2.924Vcoss ( No More )
  
Posts: 998
|
|
Re: Throttle Surge
« Reply #5 on: Apr 21st, 2009, 7:24pm » |
Quote Modify
|
Hello all. excuse my ignorance but whats a MAF ? P.S. I don't know a lot about cars .
|
|
IP Logged |
I think i'm going, erm what do you call it..... Senial....
|
|
|
Highlander
Moderator
Expert
13 Scorpios, XR4x4, Suzuki SJ413 for off road :)
Posts: 8244
|
|
Re: Throttle Surge
« Reply #6 on: Apr 21st, 2009, 7:41pm » |
Quote Modify
|
Mass Air Flow sensor, it measures the air intake into the engine and uses that measurement to adjust the running of the engine/gearchanges on an auto etc.
If you look under the bonnet of your 24v its on your right side near the front, just where the air comes out of the air filter, a metal cylinder with a multiplug and wires coming out of it.
The diesels and the 12v's dont have them
|
|
IP Logged |
on Oct 17th, 2011, 12:35pm, Simmo wrote:| I give up ! Too much for an old boy! |
|
|
|
|
pinto
Full Member
TD04 on a galaxy manifold ? whooooooosh !
Posts: 474
|
|
Re: Throttle Surge
« Reply #7 on: Apr 21st, 2009, 8:33pm » |
Quote Modify
|
Well, i took it to my brothers garage and plugged it into our V-Spec, but it pretty much revealed its hand on the way up
Surging, running badly and just would not rev, even on kick down. Add to this, nooo power regardless of how much the loud pedal was pressed....
Scan revealed two fault codes:
HGS02 Switch fault - reports running lean
HGS02 Switch Fault - reports running rich
looks like the poor ol' rattly right cat didn't think much of a 390 mile motorway run at the weekend and im guessing has partially collapsed - also explains a lot of the running issues IMO. Im guessing the two opposing codes meant that the left bank was running rich to try and compensate for the right bank lean reading ?
Just ordered a new cat from www.buypartsby.co.uk - £63.83 + VAT was pretty good
|
|
IP Logged |
|
|
|
Simmo
Administrator
I'm an OAP !
Posts: 5508
|
|
Re: Throttle Surge
« Reply #8 on: Apr 21st, 2009, 8:52pm » |
Quote Modify
|
Hope you get it sorted Geoff. Good luck and look forward to seeing the car soon. Mike.
|
|
IP Logged |
Now I'm an OAP
|
|
|
pinto
Full Member
TD04 on a galaxy manifold ? whooooooosh !
Posts: 474
|
|
Re: Throttle Surge
« Reply #9 on: Apr 21st, 2009, 8:59pm » |
Quote Modify
|
Cheers mike
whens the next Badgers Shindig planned for ?
|
|
IP Logged |
|
|
|
Simmo
Administrator
I'm an OAP !
Posts: 5508
|
|
Re: Throttle Surge
« Reply #10 on: Apr 21st, 2009, 9:42pm » |
Quote Modify
|
Should be the end of May so watch the meetings page.
|
|
IP Logged |
Now I'm an OAP
|
|
|
amigafan2003
Full Member
I'm a YaBB newbie!
Posts: 972
|
|
Re: Throttle Surge
« Reply #11 on: Apr 21st, 2009, 10:33pm » |
Quote Modify
|
Ah, that would explain it. I thought you'd have got more out of the cat as they can run witha rattle for ages but sometime they do just go.
Not a hard job to change the cat - just get the manifold gaskets in case the manifold needs to come off due to snapping a stud. Remember to get a manifold>cat gasket as well. If you do snap a stud, angle grind it flush and drill it out SLOWLY with a 9mm HSS drill bit and just nut and bolt it back together.
|
|
IP Logged |
|
|
|
amigafan2003
Full Member
I'm a YaBB newbie!
Posts: 972
|
|
Re: Throttle Surge
« Reply #12 on: Aug 6th, 2009, 1:38pm » |
Quote Modify
|
Dredging up an old thread but how did the new cat fitting go?
|
|
IP Logged |
|
|
|
pinto
Full Member
TD04 on a galaxy manifold ? whooooooosh !
Posts: 474
|
|
Re: Throttle Surge
« Reply #13 on: Aug 7th, 2009, 12:48am » |
Quote Modify
|
All done and dusted, although im hoping to get an answer soon on the ashley/decat
Still surges a little - thinking on replacing the MAF next
|
|
IP Logged |
|
|
|
|
Home
Help
Search
Members
Login
Reply
Send Topic
Print