Couger 0 Posted November 30, 2004 Report Share Posted November 30, 2004 Guys I have quite a considerable exhaust leek between the turbo and the pipe that leads down to the bottom of the car.. sorry for my ignorance Ive no idea where it goes after that , could this cause a flat spot at low revs, and more so how much is that bit of pipe, or is there a quick fix till my wallet starts talking to me again Cheers Ian Quote Im Brian and so is my wife Link to post Share on other sites
Mark Blanchard 1,642 Posted November 30, 2004 Report Share Posted November 30, 2004 That's the exhaust link pipe. Mine has rusted badly, but isn't blowing. I doubt it would cause a flat spot. I've got the occasional flat spot too at low revs. Mark 88 Turbo Quote Mark www.lotusespritturbo.com Link to post Share on other sites
pitstoppete 6 Posted November 30, 2004 Report Share Posted November 30, 2004 is this the stumble just off of idle that other people have too? my SE has it, and Marcus at PUK has asked me to tell him the counts of the idle valve from freescan when hot idling, I have done this, and since changed the idle valve for new and it still seems too low for some reason. I think an air leak or something similar. just got in from fitting a new sports silencer, and i'm quite glad i didnt buy a cat by pass pipe, as some one has already seen to the cat matrix with a large hammer and chisel inside, so now just an empty can! woo hoo - big flames time! waiting for a definitive answer on the stumble thing from marcus. mine was just leaking from the seam down the original exhaust box, and it rattled badly.no leaks anywhere else. Quote Link to post Share on other sites
Couger 0 Posted November 30, 2004 Author Report Share Posted November 30, 2004 is this the stumble just off of idle that other people have too? my SE has it, and Marcus at PUK has asked me to tell him the counts of the idle valve from freescan when hot idling, I have done this, and since changed the idle valve for new and it still seems too low for some reason. I think an air leak or something similar. just got in from fitting a new sports silencer, and i'm quite glad i didnt buy a cat by pass pipe, as some one has already seen to the cat matrix with a large hammer and chisel inside, so now just an empty can! woo hoo - big flames time! waiting for a definitive answer on the stumble thing from marcus. mine was just leaking from the seam down the original exhaust box, and it rattled badly.no leaks anywhere else. <{POST_SNAPBACK}> No this is more than a stumble, the car completely dies and will stall if I dont dip the clutch and rev hard before I pull away, its quite dangerous actually as it happens every time I pull away.. imagine stalling on a busy junction.. need it sorting ASAP Ian Quote Im Brian and so is my wife Link to post Share on other sites
pitstoppete 6 Posted November 30, 2004 Report Share Posted November 30, 2004 No this is more than a stumble, the car completely dies and will stall if I dont dip the clutch and rev hard before I pull away, its quite dangerous actually as it happens every time I pull away.. imagine stalling on a busy junction.. need it sorting ASAP Ian <{POST_SNAPBACK}> crikey, that sounds bad. i'd be looking for a lambda problem or air leak maybe on the intake side, maybe ask Marcus at puk, he seems ok with advise today! if in doubt, ask the experts! Quote Link to post Share on other sites
Mark Blanchard 1,642 Posted November 30, 2004 Report Share Posted November 30, 2004 No this is more than a stumble, the car completely dies and will stall if I dont dip the clutch and rev hard before I pull away, its quite dangerous actually as it happens every time I pull away Ah, I don't have this on mine, just the very occasional pause when accelerating. These symtems sounds nasty. Mark 88 Turbo Quote Mark www.lotusespritturbo.com Link to post Share on other sites
Paul C 15 Posted November 30, 2004 Report Share Posted November 30, 2004 No this is more than a stumble, the car completely dies and will stall if I dont dip the clutch and rev hard before I pull away, its quite dangerous actually as it happens every time I pull away.. imagine stalling on a busy junction.. need it sorting ASAP Ian <{POST_SNAPBACK}> Carbs perhaps Ian? Quote Link to post Share on other sites
Evil_Dr_Fish 1 Posted December 1, 2004 Report Share Posted December 1, 2004 Yeah - might be an idea to get the Carbs tuned properly - that may do it? Quote "When I was a kid I used to pray every night for a new bicycle. Then I realised that the Lord doesn't work that way so I stole one and asked him to forgive me." ------------------------------ G-Car Owner and Proud! Link to post Share on other sites
Couger 0 Posted December 1, 2004 Author Report Share Posted December 1, 2004 Yeah - might be an idea to get the Carbs tuned properly - that may do it? <{POST_SNAPBACK}> Thanks guys Been phoning around for 2 days,nobody up here will even entertain looking at my car anyone know of any competent tuning specialists up this way. Thanks Ian Quote Im Brian and so is my wife Link to post Share on other sites
Evil_Dr_Fish 1 Posted December 1, 2004 Report Share Posted December 1, 2004 Ummmm Sorr Ian - All I remmeber is that you were 'oop neurth'! I seem to think North East but I've no idea why since you bought yuor car form Dave who's in the Wirral... If you are near Hull try Garry Kemp he is a god in Esprit performance! ....but busier than Jesus! Quote "When I was a kid I used to pray every night for a new bicycle. Then I realised that the Lord doesn't work that way so I stole one and asked him to forgive me." ------------------------------ G-Car Owner and Proud! Link to post Share on other sites
Dermot 0 Posted December 1, 2004 Report Share Posted December 1, 2004 Ian, I presume you have a 4-cylinder car with GM/Delco ECU and management. What are you doing phoning around to get it tuned ? That does not mean anything. What you need to do is diagnoise your running problem, get a Freescan log to me, check for error codes in the ECU What ECU code are you running.. need more info to help Dermot Guys I have quite a considerable exhaust leek between the turbo and the pipe that leads down to the bottom of the car.. sorry for my ignorance Ive no idea where it goes after that , could this cause a flat spot at low revs, and more so how much is that bit of pipe, or is there a quick fix till my wallet starts talking to me again Cheers Ian <{POST_SNAPBACK}> Quote Lotusesprit.org Link to post Share on other sites
Couger 0 Posted December 1, 2004 Author Report Share Posted December 1, 2004 Ian, I presume you have a 4-cylinder car with GM/Delco ECU and management. What are you doing phoning around to get it tuned ? That does not mean anything. What you need to do is diagnoise your running problem, get a Freescan log to me, check for error codes in the ECU What ECU code are you running.. need more info to help Dermot <{POST_SNAPBACK}> Thanks Dermot No mine is the last carb model no ECU.. Something else I havent mentioned could be relevant is the heaters are not working either and they were fine before the engine swap. Cheers Ian Quote Im Brian and so is my wife Link to post Share on other sites
Mark Blanchard 1,642 Posted December 1, 2004 Report Share Posted December 1, 2004 What you need to do is diagnoise your running problem, get a Freescan log to me, check for error codes in the ECU It was the SE that first had the ECU. No ECU on Turbo's / N/A's. Mark 88 Turbo Quote Mark www.lotusespritturbo.com Link to post Share on other sites
Couger 0 Posted December 1, 2004 Author Report Share Posted December 1, 2004 Lads Have done a bit of work around the exhaust leek and cleared that up.. the flat spot is now a stumble and very driveable, still have no in car heaters Cheers Ian Quote Im Brian and so is my wife Link to post Share on other sites
Evil_Dr_Fish 1 Posted December 1, 2004 Report Share Posted December 1, 2004 It was the SE that first had the ECU. No ECU on Turbo's / N/A's. <{POST_SNAPBACK}> Hi Mark.... Surely the efi "Turbo S" will have needed one? Quote "When I was a kid I used to pray every night for a new bicycle. Then I realised that the Lord doesn't work that way so I stole one and asked him to forgive me." ------------------------------ G-Car Owner and Proud! Link to post Share on other sites
Paul C 15 Posted December 1, 2004 Report Share Posted December 1, 2004 Hi Mark.... Surely the efi "Turbo S" will have needed one? <{POST_SNAPBACK}> I 'think' some of our federal owners were given Bosch Injection in their G-cars too. One of the SE's i looked at was actually an 'S'. The owner said it was an SE but without the chargecooler and advertised it as such.... A rare and little known model. Quote Link to post Share on other sites
Esprit2 1 Posted December 4, 2004 Report Share Posted December 4, 2004 I 'think' some of our federal owners were given Bosch Injection in their G-cars too. Yeah, all US Federal 86-87 G-Turbos and the 88 S-Turbo had the Bosch FI system. Our 88 S-Turbo even retained the Citroen gearbox after everybody else got the Renault. DOM/ROW cars continued with Dellorto carbs until the GM ECU system came along in (??) 1990 (1989 in the USA). Regards, Tim Engel Minnesota, USA Quote Link to post Share on other sites
benjamincalleja 2 Posted April 24, 2012 Report Share Posted April 24, 2012 Sorry to reopen an ancient thread but I'm getting a small amount of flat spot under acceleration at pretty much any speed. I very rarely get stumble upon takeoff, maybe occasionally when the car is cold or hasn't been used for awhile. The more I use the car that stumble goes away actually... Anyway under acceleration if you accelerate lightly I get no flat spot but if I'm accelerating like a normal but then plant the accelerator the car will hesitate half a second and then accelerate like it was new out of the factory yesterday. After that i find doing the exact same thing results in no flat spot just instant acceleration but 2 or 3 minutes of normal driving will result in a flat spot again when flooring it.....hope that made sense....very odd.....any ideas. 1 Quote Link to post Share on other sites
Vulcan Grey 251 Posted April 24, 2012 Report Share Posted April 24, 2012 does your 89 have the GMP4 distributorless ignition? (all of the USA 89's had the GMP4 system) Quote Travis Vulcan Grey 89SE My Lotus Photo and Projects Album Link to post Share on other sites
benjamincalleja 2 Posted April 25, 2012 Report Share Posted April 25, 2012 It's an 89 MY but a nov 88 uk car so it has carbs Quote Link to post Share on other sites
rogerch 63 Posted April 25, 2012 Report Share Posted April 25, 2012 Check for air leaks around the induction side, I have a vacuum leak detector which is quite handy, but favorite are the "O" rings the Dellortos are mounted on. If you have not replaced them you probably should anyway. Also check the balance tubes between the carburetors. Quote Life is like a sewer, what you get out of it, depends on what you put into it. (Tom Leahrer) Link to post Share on other sites
red vtec 174 Posted April 25, 2012 Report Share Posted April 25, 2012 Have you got the carbs balanced? I did mine and it made a difference. I bought a morgan carbtune off ebay. I have a Pdf about tuning the cars. if you want a copy pm me. I think there is a flat spot around 3K as its where the jets swap over. Also check the throttle cable I had about an inch of slack on mine, that made it stumble! Chris Quote Amateurs built the Ark Professionals built the Titanic "I haven't ridden in cars pulled by cows before" "Bullocks, Mr.Belcher" "No, I haven't, honestly" Link to post Share on other sites
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