SERIOUSLY hesitating & back firing!

[neil_jdmr]

Just thought of something else that causes similar symptoms to what you have described.
 
Check, (if fitted) to make sure the cat is not blocked as if the internals collapse and block up this causes loss of power and some major bucking/backfire

[Dizz]

Just thought of something else that causes similar symptoms to what you have described.
 
Check, (if fitted) to make sure the cat is not blocked as if the internals collapse and block up this causes loss of power and some major bucking/backfire

Hhhmmm must check if it has a cat alright, I\'d be guessing it doesn\'t but must check! Cheers mate

[bnaellis]

When does it back fire when you back off of accelerator and the revs are coming down?


rgds
Brian

[Dizz]

When does it back fire when you back off of accelerator and the revs are coming down?
 
 
rgds
Brian

No basically the car will have no power & be seriously lumpy, wont rev out then it will chug a bit & back fire then be perfect straight after.
 
I couldnt get it to clear out on Sunday nite before switching it off so just left it & drove my evo for the last two days. Then went to start it tonight & it started on the button as usual but was hesitating & bucking for a few seconds of driving then cleared out & drove perfect but didn\'t go far in it (so didn\'t get to heat up 100% which is when it seems to happen, when hot)
 
Weird.....

[bnaellis]

No basically the car will have no power & be seriously lumpy, wont rev out then it will chug a bit & back fire then be perfect straight after.
 
I couldnt get it to clear out on Sunday nite before switching it off so just left it & drove my evo for the last two days. Then went to start it tonight & it started on the button as usual but was hesitating & bucking for a few seconds of driving then cleared out & drove perfect but didn\'t go far in it (so didn\'t get to heat up 100% which is when it seems to happen, when hot)
 
Weird.....

Has the car been mapped or is it runing on base map?
can you check that the primary injector connectors are pushed on fully?


rgds
Brian

[Dizz]

Has the car been mapped or is it runing on base map?
can you check that the primary injector connectors are pushed on fully?
 
 
rgds
Brian

Very valid question about the map. Basically the story with the car is that the engine went while pip was mapping it & then came back to Ireland on a trailer. The engine was rebuilt by Eddie Doyle over here & was left sitting, then I bought it. I need to get it mapped obviously but am only half way through the run in mileage & still sticking to the 2,500 rpm. If I go over the 2,500 rpm the knock light flashes so never do. I\'m in a catch 22, can\'t get it mapped because it\'s still being run in & can\'t drive it over 2,500 cause of the map lol. Really need to get the map at least checked but no one in this country really

[bnaellis]

Very valid question about the map. Basically the story with the car is that the engine went while pip was mapping it & then came back to Ireland on a trailer. The engine was rebuilt by Eddie Doyle over here & was left sitting, then I bought it. I need to get it mapped obviously but am only half way through the run in mileage & still sticking to the 2,500 rpm. If I go over the 2,500 rpm the knock light flashes so never do. I\'m in a catch 22, can\'t get it mapped because it\'s still being run in & can\'t drive it over 2,500 cause of the map lol. Really need to get the map at least checked but no one in this country really

You don\'t need to stick to 2,500 to run an engine in. What injectors do you have fitted to the car? So for length between replies i\'m snowed under at work.



rgds
Brian

[Dizz]

You don\'t need to stick to 2,500 to run an engine in. What injectors do you have fitted to the car? So for length between replies i\'m snowed under at work.
 
 
 
rgds
Brian

No problem at all mate, I really appreciate the help. I have to stick to the 2,500 either way because of the knock level & not being able to get it mapped till it\'s run in. As for the injectors I\'m embarrassed to say I have no idea... The previous owner lost the spec sheet for the car & I\'ve been able to work out most things but that\'s one thing I haven\'t. Is there any way of finding out?
 
I just took the car for a quick spin there (as the exhaust is incredibly loud & I live in a built up area so couln\'t stay out long) The car drove fine pretty much so it just seems to be when the engine gets hot from decent drive (engine bay temps perhaps?). I guess I won\'t really know till I bring it for a proper drive tomorrow night :rolleyes:

[Jovic82]

mine only used to do it when the auto warm up sequence had finished and the idle revs dropped. dont know why or how but it did!

[bnaellis]

No problem at all mate, I really appreciate the help. I have to stick to the 2,500 either way because of the knock level & not being able to get it mapped till it\'s run in. As for the injectors I\'m embarrassed to say I have no idea... The previous owner lost the spec sheet for the car & I\'ve been able to work out most things but that\'s one thing I haven\'t. Is there any way of finding out?
 
I just took the car for a quick spin there (as the exhaust is incredibly loud & I live in a built up area so couln\'t stay out long) The car drove fine pretty much so it just seems to be when the engine gets hot from decent drive (engine bay temps perhaps?). I guess I won\'t really know till I bring it for a proper drive tomorrow night :rolleyes:

The knock light lights up for other stuff other thank just knock.
You will not be seeing knock at rpm regards of half or full throttle.
If you rev the car in neutral once you go above 2500 rpm?
Do you have the commander or datalogit to hand to check what seetings for injectors are?
when you say your not mapped yet, does that mean your running on base map?
injectors are under the upper intake manifold. I will upload a pic in a sec.


rgds

Brian

[Dizz]

The knock light lights up for other stuff other thank just knock.
You will not be seeing knock at rpm regards of half or full throttle.
If you rev the car in neutral once you go above 2500 rpm?
Do you have the commander or datalogit to hand to check what seetings for injectors are?
when you say your not mapped yet, does that mean your running on base map?
injectors are under the upper intake manifold. I will upload a pic in a sec.
 
 
rgds
 
Brian

The knock reading on the hand commander is high though too especially when the knock (heat) light comes on. I have the hand commander in the car yes, can I find out what size the injectors are from that? (I know obviously it might be wrong) A huge problem I have is that I don\'t know who the last person to put a map on the car was, I can only presume it was PIP when it blew on the dyno as I don\'t think the person who rebuilt the engine after would have gone near it. Just wish there was someone around Dublin/Ireland who could have a look for me or a way of getting it checked by someone in UK without actually driving over
 
I can see two of the injectors, pretty new looking & light blue in colour if that means anything??? :confused:

[ianelvar]

A few things I can think of to look at chap. Does it smell of petrol really badly when it\'s misbehaving? If yes, then you might well have some kind of misfire and it\'s not burning properly. Check ignition related stuff.
If not, I suspect it\'s running really lean (this is more likely from what you\'re describing) and you\'ve got a faulty pump or power supply to pump, or possibly a bad connection to one of the primary injectors, or even a faulty/sticky injector.

[bnaellis]

The knock reading on the hand commander is high though too especially when the knock (heat) light comes on. I have the hand commander in the car yes, can I find out what size the injectors are from that? (I know obviously it might be wrong) A huge problem I have is that I don\'t know who the last person to put a map on the car was, I can only presume it was PIP when it blew on the dyno as I don\'t think the person who rebuilt the engine after would have gone near it. Just wish there was someone around Dublin/Ireland who could have a look for me or a way of getting it checked by someone in UK without actually driving over
 
I can see two of the injectors, pretty new looking & light blue in colour if that means anything??? :confused:

Those will be Bosch 1600 or 1680cc secondary injectors. If you look carefully at the primary injectors you can see a tiny bit of colour at the top are they burgundy?

You can give me a call tomorrow during my lunch break as that\'s literally the only time im free at work. I will talk you through the use of the hand controller.


rgds
Brian
07590 539 624

[Dizz]

A few things I can think of to look at chap. Does it smell of petrol really badly when it\'s misbehaving? If yes, then you might well have some kind of misfire and it\'s not burning properly. Check ignition related stuff.
If not, I suspect it\'s running really lean (this is more likely from what you\'re describing) and you\'ve got a faulty pump or power supply to pump, or possibly a bad connection to one of the primary injectors, or even a faulty/sticky injector.

Ye mate, it reeeeks of petrol wen its happening & theres black smoke until it clears out of it... I guess I\'m going to need to be checking the coils (which I presume is a plenum off jobie?) Just wish I had another set of coils to try in it...

@ bnaelli: I\'m really really sorry mate, I\'m only seeing this now. I don\'t get on at all during the day... I really appreciate your help though. Only thing is the car is too bad to drive so I haven\'t been bringing it into work lately so wouldn\'t have it to hand if I rang you on a lunch break :o

[Dizz]

Oh & what are these boxes that are attached to my injectors???




Pic of the (secondary?) injectors: