Hi all,

First of all apologies for a question prior to introduction but have been lurking for many years just never had anything constructive to say!

Just before christmas my other half bought me a "380bhp" MSD and a set of Siemens injectors for my 92 4wd Sapphire.

I fitted the chip and ran it for a while and was never overly impressed with the response off boost and it seemed to cough a bit when flat out, seeing as I don't really use the car much (300 miles in six months) so didn't fiddle with it until recently I checked the CO at work after it costing me over £50 to do a 210 mile round trip to Santapod for Central Day and the CO was @ 8.5% on idle.

I managed eventually to get the CO down to more sensible levels only to find that once the car had been left to cool down and restarted the CO would lean right out to 0.15% ish and then start to hunt.

So I then replaced all of the engine sensors including Crank, phase, ECT, ACT, coil pack, plugs, TPS, the ignition leads are no more than 1 year old and the MAP sensor appears to be working when reference checked with a multimeter, I have had the ecu out and tested the resistance of all the sensors with the engine off and then checked the sensor voltages when the engine is running.

I have pressure tested the inlet system etc to 3 bar and the only small leak I found was at the top of the idle control valve through the actual electrical plug but Stu advised me this was not uncommon and not to worry and it was very tiny and only apparant after 2.5 bar.

Stu has since sent me a recalibrated ECU file with revised idle fuelling but this has not cured the issue as it still gets richer the warmer it gets!!

Any help or input would be greatly appreciated, some have suggested ditching the MSD set up and getting one of the other tuners to map it etc but seeing as we have already paid for the MSD gear it makes no sense in spending more until this problem is cured.

Just for reference if I put back the old "Ahmed" chip and greens the CO is spot on after setting it up.

Any input would be gratefully appreciated as I'm utterly pissed off with the fact that I have spent 7 months restoring the car and now don't want to drive it for fear of washing the bores out because my car has a rather unhealthy appetite for petrol!

Cheers

Derek

 

sorry to hear about your problems - i ran msd set up without issues on mine.

were the injectors new? perhaps one is sticking open? or possibly there is a problem with the wiring to the injectors.

does the iscv work as it should?

 

Welcome to the site, without bashing MSD who do a decent job mostly the chip can only ever by it's nature be an all round chip, and you will get variations, every engine is different.
Without knowing your engine itself maybe someone else has made a mod you are unaware of, which is throwing the chip/fuelling out.
The quickest and cheapest way by far is get all your mods done then take and have it live mapped, it will be perfect then, each tuner likes slightly different things however, but most of the big names do a good job, msd nms to name but a few, you seem to have covered all that would normally be suggested, but a live map will find out the problem for you.
If you were planning lots more mods in the future I would seriously consider going aftermarket ecu, as I did best thing I ever did, can now get over 400 to a tank, that was with 200,937 miles on the engine, now stripped for rebuild, emissions were 0.97% CO, 137ppm at idle on a T34, with GREY injectors, off boost power was awsomely improved with live map, picks up from 1400 full boost by 2500.
tabetha

 

I know many who un MSD software etc with no issues and had hoped to do the same, as I have said to Stu I am not blaming the chip or anything they have done but would very much like to sort it out!, the injectors were supplied at the same time as the chip and are new siemens injectors.

ISCV has been set up and working fine, once I had renewed the seized adjusting screw that is!


I fully appreciate the pitfalls of chip tuning and if money were no object with this car then I would of course look down the live map or alernative ECU route but having done the whole Motec, Autronic ECU with previous cars I begrudge spending that sort of money on a car that comes out once a month fr a quick hoon and then gets parked up again for the rest of the month!!

I also appreciate how difficult it is to remotely tune a car via a generic chip and I went in eyes wide open and would accept some niggles but the fact that the CO is so erratic is not really down to a "generic chip" thing its more of an actual fault but having checked everything I was just wondering if something else could cause it and I have miseed it off the list of checks!

I also know a live MAP would sort the car but again begrudge chucking X amount on a chip only to find out after a few miles its not suitable and becomes bin fodder!

As explained to Stu I dont have the time or opportunity to escape to Blackpool for a day until much later on in the year and every other tuner I have spoke to can't work or won't work with MSD chips due to encryption etc so this leaves me in a situation where I have to figure out as much as I can on my own!

Cheers

 

strange how it seems fine with the other chip , i,d get a setup sorted on it asap making sure its all safe just because you dont use it much isn,t a reason to overlook it. Could the different injectors be causing an issue? just my thoughts

could you not get somebody to take the car to blackpool