Diesel remap problem
10 July 2011, 10:32 AM
#1
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Diesel remap problem
I had my Honda Accord 2.2 iCTDI remapped by a company called Chiptuners about 6 months ago.
I have noticed as the weather has got warmer, the car has been taking longer to start. There have been times where the car has not started at all.
I thought there was a problem with the diesel pump, but i have had this inspected by an independent diesel pump specialist and the pump is fine.
I strongly believe it could be an issue with the remap, but i am not sure.
Has anyone ever experienced this problem before when having a diesel engine remapped? Or have any ideas what it could be?
I have noticed as the weather has got warmer, the car has been taking longer to start. There have been times where the car has not started at all.
I thought there was a problem with the diesel pump, but i have had this inspected by an independent diesel pump specialist and the pump is fine.
I strongly believe it could be an issue with the remap, but i am not sure.
Has anyone ever experienced this problem before when having a diesel engine remapped? Or have any ideas what it could be?
10 July 2011, 10:41 AM
#2
Hi sorry I can't offer any advice but I'm looking to get the same engine remapped in my crv and any problems that go along with it will help me!
Could it be something to do with the amount of fuel it takes to start it from cold? Have you spoke to the tuner again?
Hope you get it sorted!
Doug
Could it be something to do with the amount of fuel it takes to start it from cold? Have you spoke to the tuner again?
Hope you get it sorted!
Doug
10 July 2011, 11:48 AM
#4
Its possible that fuel rail is taking longer to pressurise; The ECU won't trigger the injectors until it sees adequate pressure in the fuel rail. This could be a leak down issue either via a faulty injector or pressure relief or fault in the pump unit. Or pressure sensor fault. Or supply to the pump.
On the otherhand it could be a position sensor problem (crank, cams or pump). Or the fuel tank lift pump is dodgy (there is a supply pump from the tank as well as a high pressure pump in the engine bay for the injectors), also a leak between the two can cause air to get in the system; diesels hate air in the fuel and are a bugger to start when it happens..
In otherwords, anything can cause this. So can't really blame a remap for that, and as such very unfair to blame this first (like people blaming a garage when their car goes wrong a few months after aservice).
The only thing remap wise I can think of that can be a bit dubious is if they swap the fuel rail pressure relief valve; which is sometimes done to allow more tunability. However there are far too many other more likely factors/causes (as mentioned above) to blame first.
On the otherhand it could be a position sensor problem (crank, cams or pump). Or the fuel tank lift pump is dodgy (there is a supply pump from the tank as well as a high pressure pump in the engine bay for the injectors), also a leak between the two can cause air to get in the system; diesels hate air in the fuel and are a bugger to start when it happens..
In otherwords, anything can cause this. So can't really blame a remap for that, and as such very unfair to blame this first (like people blaming a garage when their car goes wrong a few months after aservice).
The only thing remap wise I can think of that can be a bit dubious is if they swap the fuel rail pressure relief valve; which is sometimes done to allow more tunability. However there are far too many other more likely factors/causes (as mentioned above) to blame first.
Last edited by ALi-B; 10 July 2011 at 11:53 AM.
10 July 2011, 12:39 PM
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Its possible that fuel rail is taking longer to pressurise; The ECU won't trigger the injectors until it sees adequate pressure in the fuel rail. This could be a leak down issue either via a faulty injector or pressure relief or fault in the pump unit. Or pressure sensor fault. Or supply to the pump.
On the otherhand it could be a position sensor problem (crank, cams or pump). Or the fuel tank lift pump is dodgy (there is a supply pump from the tank as well as a high pressure pump in the engine bay for the injectors), also a leak between the two can cause air to get in the system; diesels hate air in the fuel and are a bugger to start when it happens..
In otherwords, anything can cause this. So can't really blame a remap for that, and as such very unfair to blame this first (like people blaming a garage when their car goes wrong a few months after aservice).
The only thing remap wise I can think of that can be a bit dubious is if they swap the fuel rail pressure relief valve; which is sometimes done to allow more tunability. However there are far too many other more likely factors/causes (as mentioned above) to blame first.
On the otherhand it could be a position sensor problem (crank, cams or pump). Or the fuel tank lift pump is dodgy (there is a supply pump from the tank as well as a high pressure pump in the engine bay for the injectors), also a leak between the two can cause air to get in the system; diesels hate air in the fuel and are a bugger to start when it happens..
In otherwords, anything can cause this. So can't really blame a remap for that, and as such very unfair to blame this first (like people blaming a garage when their car goes wrong a few months after aservice).
The only thing remap wise I can think of that can be a bit dubious is if they swap the fuel rail pressure relief valve; which is sometimes done to allow more tunability. However there are far too many other more likely factors/causes (as mentioned above) to blame first.
What he said!
10 July 2011, 10:09 PM
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Thanks for the very informative reply ALi-B. That gives me some more possibilities of what to look into.
I was hoping it wouldn't be the remap because the car feels great to drive since it was remapped, and i'd hate to go back to standard again!
I have actually had the glowplugs and battery changed, so that eliminates that possibility.
I was hoping it wouldn't be the remap because the car feels great to drive since it was remapped, and i'd hate to go back to standard again!
I have actually had the glowplugs and battery changed, so that eliminates that possibility.
12 July 2011, 06:17 AM
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look at the cheap things first
Get some clear hose run it from the fuel filter to the pump to see if any air is in it,
leak off test which you can do yourself (just need adequate length of fuel hose), then cheap things like cam/crank/temp sensor.
Problems like this with diesels can be a nightmare!
Get some clear hose run it from the fuel filter to the pump to see if any air is in it,
leak off test which you can do yourself (just need adequate length of fuel hose), then cheap things like cam/crank/temp sensor.
Problems like this with diesels can be a nightmare!
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12 July 2011, 08:19 AM
#8
have you had a fault checker on it, it could be your coolant temp sensor, it acts a bit like a old choke(not exactly but it helps explain) so if the ecu is getting the wrong coolant temp on start up it may be fuelling it wrong and causing your starting issues,
also have you been on the Honda forums? there may be a vac hose that`s common like on old vectra`s.
also have you been on the Honda forums? there may be a vac hose that`s common like on old vectra`s.
12 July 2011, 10:52 AM
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If you havent had the ECU read for fault codes and had the data stream examined. Stop where you are.
Book it in somewhere to have exactly that done before you throw away good money and time.
Book it in somewhere to have exactly that done before you throw away good money and time.
12 July 2011, 11:41 AM
#10
If its the pump or injectors seals - air getting in, you will generally have running issues too as well as the starting issue.
Generally speaking - if its an air problem it will be smokey when it does start.
Not heard of too many issues on the Honda but the 03/04 accord did have a few issues with diesel pumps and cracked exhaust manifolds. Most failed pretty easly. Other common issue is the chain tensioner.
Glow-plugs, although fitted are rarely used to start the car in modern high pressure common rail diesel engines. Thats a whole other discussion though. LOL
Sensors - generally a faulty sensor like fuel pressure, TDC, cam, pump position etc will throw a CEL light.
The fact that the car was mapped 6 months ago and has been fine sinse would lead me to look at other things first.
It sounds like you may have a hot start issue?? Is the car OK to start first thing, but not so good after a run?
Not the most productive post I know but these issues can be very difficult to diagnose.
Agree with the above, have the car checked out. Read any fault codes, read diagnosis on sensors etc. I am not too faliliar with the diesel honda engine and ECU system but an expert should be able to run a few checks and diagnose the issue pretty quickly.
Generally speaking - if its an air problem it will be smokey when it does start.
Not heard of too many issues on the Honda but the 03/04 accord did have a few issues with diesel pumps and cracked exhaust manifolds. Most failed pretty easly. Other common issue is the chain tensioner.
Glow-plugs, although fitted are rarely used to start the car in modern high pressure common rail diesel engines. Thats a whole other discussion though. LOL
Sensors - generally a faulty sensor like fuel pressure, TDC, cam, pump position etc will throw a CEL light.
The fact that the car was mapped 6 months ago and has been fine sinse would lead me to look at other things first.
It sounds like you may have a hot start issue?? Is the car OK to start first thing, but not so good after a run?
Not the most productive post I know but these issues can be very difficult to diagnose.
Agree with the above, have the car checked out. Read any fault codes, read diagnosis on sensors etc. I am not too faliliar with the diesel honda engine and ECU system but an expert should be able to run a few checks and diagnose the issue pretty quickly.
Last edited by duncatr; 12 July 2011 at 11:44 AM.
14 July 2011, 07:29 PM
#11
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Result! Turns out it was a faulty injector after all.
Car starts perfectly again. Such a relief after having this problem dragging on for weeks.
However, the worrying thing is I took it to a honda dealer a few weeks ago and they diagnosed it as a faulty pump, and were going to charge me £2k for it!
Glad i didn't take their word for it.
Car starts perfectly again. Such a relief after having this problem dragging on for weeks.
However, the worrying thing is I took it to a honda dealer a few weeks ago and they diagnosed it as a faulty pump, and were going to charge me £2k for it!
Glad i didn't take their word for it.
20 July 2011, 11:45 AM
#12
Glad you got it sorted.
They aint cheap for parts. My VSA light has been on for a while. ABS still works but the TC & VSA don't. £1800 as its all 1 piece just due to a pressure sensor in the unit
Can get them repaired for £380 but its still a PITA.
VW's have the same issue but they pushed Bosch into coming up with a re-dress kit thats around £120. Honda have not done this yet and they run different units.
They aint cheap for parts. My VSA light has been on for a while. ABS still works but the TC & VSA don't. £1800 as its all 1 piece just due to a pressure sensor in the unit
Can get them repaired for £380 but its still a PITA.
VW's have the same issue but they pushed Bosch into coming up with a re-dress kit thats around £120. Honda have not done this yet and they run different units.
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