Flat Spot

[Couger]

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

[Mark Blanchard]

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

[pitstoppete]

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.

[Couger]

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

[pitstoppete]

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!

[Mark Blanchard]

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

[Paul C]

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?

[Evil_Dr_Fish]

Yeah - might be an idea to get the Carbs tuned properly - that may do it?

[Couger]

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

[Evil_Dr_Fish]

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!

[Dermot]

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}>

[Couger]

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

[Mark Blanchard]

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

[Couger]

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

[Evil_Dr_Fish]

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?

[Paul C]

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.

[Esprit2]

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

[benjamincalleja]

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.

[Vulcan Grey]

does your 89 have the GMP4 distributorless ignition? (all of the USA 89's had the GMP4 system)

[benjamincalleja]

It's an 89 MY but a nov 88 uk car so it has carbs

[rogerch]

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.

[red vtec]

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