Engine cuts out when slowing down

'92 Si VTEC · Post by **jjmartin349571** » Wed Dec 11, 2013 7:05 pm

What cables are blocking the wing air inlet matey?? I'd keep it connected personally, it's there to draw cold outside air as opposed to warmer engine bay air

looks funky too

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Wed Dec 11, 2013 7:16 pm

Rob_Cool1 wrote:
Merlin wrote:It could be TPS/IACV related. The car may not be getting enough air at idle and the sudden shutting off of the throttle body when you press the clutch may not be allowing enough air to get through.

You can test the TPS by measuring the resistance across its contacts. There is a test procedure in the service manual
I think your right, I dont really like the design on the air filter because where it connects into the hole in the wing there are too many cables in the way so its only getting half the air.

Difficult to tell from the photo, but looks like that that thing should be twisted round slightly and actually plug in to the hole in the wing? As you say, at the moment it would be getting seriously restricted air flow.

Rob_Cool1 · Post by **Rob_Cool1** » Wed Dec 11, 2013 9:29 pm

it's all the wires coming out of the fuse box :S dont see why i cant put it in as it was before :/

Yeah its a really awkward shape but in the morning il take it all off and put that bit in first then the rest. Yeah it plugs in but i cant pull it enough to get in as the wires from the fuse box are in the way but as i said il take it off and put that bit in first then the rest

Post by **Lude-dude** » Thu Dec 12, 2013 10:25 am

how about valve clearance's?

if there way out might cause these symptoms?

Rob_Cool1 · Post by **Rob_Cool1** » Wed Jan 08, 2014 4:00 pm

hey, sorry to bring this up again but its cutting out a lot more now

the inlets now put into the wing properly and ive changed the air filter.

I've been having an issue since ive got the car back where the speedo cuts out, thats when the engine cuts out when i pull up. when the speedo's working its fine :S where's all the connectors for the speedo? would there be a link with the speedo and engine cutting out at the same time lol?

Also in another topic i did a little while ago i think the exhaust cam pulley has shifted a bit, so could the exhaust valve be closing too quickly leaving too much exhaust gases in the chamber so restricting the air+fuel coming in?

starting to become a bit of an issue happening more regularly now

cheers everyone

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Wed Jan 08, 2014 4:20 pm

Firstly, check your battery connections to make sure they're all making good contact and properly secure, then check all engine earths are in place and properly secure. If in doubt, undo them, clean and re-attach.

Other than that, not familiar with 2nd Gens, but...
Is this an MPI engine?
If so, speedo will probably get its signal from the ECU?
If so, then speedo is probably a symptom rather than a cause, i.e. something is causing the ECU to shut down and as a result you lose signal to the speedo (and engine shut down).

If that's the case, then check the security of all electrical plugs in the engine bay, to the fuse box and ECU.
If you don't find any loose, take each of them apart in turn and inspect for dirt/corrosion/bent/damaged pins not making contact/water ingress etc. If you can't see anything wrong, give each one a spray with electrical contact cleaner and re-connect.

Do you get any other lights up when the engine cuts out? Does the battery light come on for example and is this just before it cuts out, or before?

'92 Si VTEC · Post by **jjmartin349571** » Wed Jan 08, 2014 4:22 pm

The speedo is cable driven on 2G's, so I wouldn't expect the speedo to just go dead as it's a mechanical connection?

It's fairly easy to get the speedo cable out of the VSS though so maybe you could check it for damage, maybe it's not engaging properly at one end? If you're stationary and the engine cuts out though isn't it normal for the speedo needle to drop down?

Also, have you checked for air leaks on your manifold?? The engine was rebuilt, so maybe something wasn't reconnected correctly when it was put together?

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Wed Jan 08, 2014 4:29 pm

Ok so speedo signal from the ECU is a red herring then.
I still suggest it's worth checking all the electrics I've mentioned though.

Add to that checking the fuse box for dirt/corrosion/water ingress (having seen where it is, right next to the bonnet/wing gap).
After that, it's checking ignition switch (and does an mpi 2g have a main relay?

)

Rob_Cool1 · Post by **Rob_Cool1** » Wed Jan 08, 2014 4:48 pm

jjmartin349571 wrote:The speedo is cable driven on 2G's, so I wouldn't expect the speedo to just go dead as it's a mechanical connection? It's fairly easy to get the speedo cable out of the VSS though so maybe you could check it for damage, maybe it's not engaging properly at one end? If you're stationary and the engine cuts out though isn't it normal for the speedo needle to drop down?

Also, have you checked for air leaks on your manifold?? The engine was rebuilt, so maybe something wasn't reconnected correctly when it was put together?

Il have a look, where does it connect too on the engine? when it cuts out the needle doesnt move so im guessing it looses connection, its weird because a lot of the time it starts working again after a few minutes but recently hasnt

Thats a good point, il double check the bolts for the inlet manifold etc as well, that happened to my mini air was coming in through the gasket and it ran stupidly lean lol.

wurlycorner wrote:Ok so speedo signal from the ECU is a red herring then.
I still suggest it's worth checking all the electrics I've mentioned though.

Add to that checking the fuse box for dirt/corrosion/water ingress (having seen where it is, right next to the bonnet/wing gap).
After that, it's checking ignition switch (and does an mpi 2g have a main relay? )

Yep will check all of that tomorrow too, hopefully its something simple :L
could i reset the ECU see if that does anything? if so would i just take the battery off and leave it for a while?

Rob_Cool1 · Post by **Rob_Cool1** » Wed Jan 08, 2014 4:52 pm

wurlycorner wrote:Do you get any other lights up when the engine cuts out? Does the battery light come on for example and is this just before it cuts out, or before?

the battery, engine light definitely come on as soon as it cuts out and maybe the PGM-FI, not too sure about that il have to go back out and check when it next cuts out :L