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| karthead |
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karthead
Trackday Trickster
Joined: 01 Apr 2012
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 Posted: 08:40 - 19 Aug 2012  Post subject: Running rough (car alert) |
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Alrighty, head gasket replacement done, car works (Ford Telstar TX5 Ghia 1993, 2.0 I4 DOHC Fuel injection. Same as Mazda 626). The problem now is that it is running rough. The timing is all correct. The basic problems/symptoms:
- hesitation when revving, along with faint, dark smoke.
- subtle engine vibrations every second or so (accompanied by a little decrease in rpm, but goes up again)
- low 'putt putt' sound from exhaust every second or so, also accompanied by the decrease in rpm. i think it happens in conjunction with the vibrations.
- it cant idle by itself, it dies, except after a good 5 minute warm up.
- hard to start.
- spark plugs are extremely black.
Some more info: There are 2 sensor thingos that are attached to a metal coolant thing which attaches to the head (the metal thing has thick rubber tubes, etc). The sensor things snapped, but i glued it back together so the metal connections line up. I'm guessing the sensor things are connected to a big computer which dictates the fuel injection. If i didn't glue it right (im guessing i didn't. ill get new ones anyway), could that be where the problem lies? After a bit of thought, the sensors probably aren't working which is telling the computer that the engine is cold, and putting the injectors in some sort of choke mode?
Also, there is an audible, though not loud, hissing or sizzling sound after the engine has been running. I'm not too worried about it ATM, but could it mean i didn't do something right?
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| lukamon |
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lukamon
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Joined: 18 May 2007
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| karthead |
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karthead
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| nowhere.elysium |
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nowhere.elysium
The Pork Lord
Joined: 02 Mar 2009
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| Posted: 11:21 - 19 Aug 2012 Post subject: Re: Running rough (car alert) |
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| andresoccer10 wrote: | The sensor things snapped, but i glued it back together so the metal connections line up. |
Facepalm.jpg
Is a soldering iron too much to ask? Seriously - it doesn't matter if half the plastic crap surrounding the sensor is hanging off, just make sure that you've got electrical continuity before you do anything more; otherwise you're just going to keep fouling plugs, and attracting the ire of BCF's mechanical types.
| andresoccer wrote: | Also, there is an audible, though not loud, hissing or sizzling sound after the engine has been running. I'm not too worried about it ATM, but could it mean i didn't do something right? |
I'd be thinking coolant leak. Has there been any discernible change in the coolant level since starting it back up?
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karthead
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karthead
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| Shaft |
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Shaft
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Posted: 07:48 - 20 Aug 2012  Post subject: |
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^^^^ what he said 
| andresoccer10 wrote: |
BTW i tried running the car without air cleaner to see if it ran smoother, here are the results:
- better idling
- bit less 'putt putts'
- less smoke at idle, but still dark smoke when revving
- spark plug proved to be a tad not as black
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Air filters, by their very nature, restrict air flow a little; remove filter + increase air flow = mixture leans off slighty, engine runs better.
BTW, if it's running that rich that it barely ticks over, all that unburnt fuel will be doing a great job of washing the oil off the bores, so you don't want to be doing that for long.
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karthead
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| Posted: 09:10 - 20 Aug 2012 Post subject: |
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Thankyou both ever so much with your responses. Shaft i was worried about that also, so i'm trying to lessen how much i start it so i can get it running properly. CHR15- your knowledge amazes me . All makes sense now. I was going to replace those sensors but never got around to it because i was busy doing other things with the car.
So those coolant sensors are obviously the temp sensors you are speaking of, CHR15? Would you briefly explain how touching the wires work to get it running better?
Also, there are two of those sensors, they look basically the same but are different colour, they are located next to eachother. They both happened to break, would i do the wire trick with both?
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karthead
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karthead
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Old Thread Alert!
The last post was made 13 years, 138 days ago. Instead of replying here, would creating a new thread be more useful? |
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I put new coolant in it before I started if for the second time, I didn't take notice of the level.
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