Cold start, Lots of smoke
Moderator: Fatmobile
Cold start, Lots of smoke
I have a 84 diesel rabbit. When I start it up cold it smokes like a SOB and runs like crap. Once it warms up, she runs awesome, no smoke unless I gas it from a standstill.
The other issue is a major lack of power. I know these engines only have 58hp, but dont have have almost 80ft/lbs? any hill when on the freeway I must downshift to 4th, if not 3rd to keep up my speed.
any help would be awesome.
The other issue is a major lack of power. I know these engines only have 58hp, but dont have have almost 80ft/lbs? any hill when on the freeway I must downshift to 4th, if not 3rd to keep up my speed.
any help would be awesome.
I just went through the same senario with my '81!
I suspect your injectors.
You don't say how many miles on this unit, but seems general concensous is the injectors are good for 60-100K miles.
Swapped mine for set of rebuilt and been cruising at high mach ever since.
OK, maybe not anywhere near high mach numbers. But, she runs well so much better!
Also if you decide to replace injectors get the 3.5mm fuel return line before you replace the injectors.
It saves so much pain and diesel fuel.
Uh, someone I know didn't, and wasted a lot of fuel and could have potentially destroyed his coolant hoses as well as his timing belt.
I suspect your injectors.
You don't say how many miles on this unit, but seems general concensous is the injectors are good for 60-100K miles.
Swapped mine for set of rebuilt and been cruising at high mach ever since.
OK, maybe not anywhere near high mach numbers. But, she runs well so much better!
Also if you decide to replace injectors get the 3.5mm fuel return line before you replace the injectors.
It saves so much pain and diesel fuel.
Uh, someone I know didn't, and wasted a lot of fuel and could have potentially destroyed his coolant hoses as well as his timing belt.
All problems can be solved with the appropriate application of antimatter!
'81 Rabbit 125K
'88 GMC Step Van P-30 6.2L
Detroit Diesel 2-71 Generator
'81 Rabbit 125K
'88 GMC Step Van P-30 6.2L
Detroit Diesel 2-71 Generator
I just checked my injectors when the engine was warm, cracking the fuel line and each time the rpm dropped. I am now waiting for the engine to cool down to test it when it's cold.
My other question with the car has been that cold start knob. Do I use is as a choke? full on to start, half till warm, then off? the car does not want to idle as well when I don't pull it out on a cold morning, but once warm, if I pull it out, I dont get and funny running engine.
No I have been checking a few things, and I think #4cyl is low compression due to a leaking injector seal, when I put some water over the injector I get bubbles from the head and injector. I am going to try putting in new heatshields and hope that solves the issue. Can I put anything on the threads as a sealant aswell?
My other question with the car has been that cold start knob. Do I use is as a choke? full on to start, half till warm, then off? the car does not want to idle as well when I don't pull it out on a cold morning, but once warm, if I pull it out, I dont get and funny running engine.
No I have been checking a few things, and I think #4cyl is low compression due to a leaking injector seal, when I put some water over the injector I get bubbles from the head and injector. I am going to try putting in new heatshields and hope that solves the issue. Can I put anything on the threads as a sealant aswell?
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- Turbo Charger
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Its a good idea to maybe put a little copper coat or something like that on the threads. The cold start knob is real a timing advance. It helps in starting. If you look under technical tips on this site you will see a procedure. Most cars will vary a little because of compression, timing and pump condition. Mine start better with it in. Then I put it out once it starts. If the cars warm or above 10C I put it out to start.
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- Cetane Booster
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hmm, ok, I will check the glow plugs. The injectos look to have never been replaced. I don't really want to spend the $100+ for new injectors if I don't need to. I am fairly mechanicly inclined, how hard is it to rebuild a injector? am I better off to buy new ones if they are worn out? I don't have a pop tester, nor do I know of any shops in the area that could test them. Any other diagnostic tips based on my issues?
with the injectors out, one can look in the holes and see the glow plugs glow bright red- this will most likley be your issue
I had my injectors rebuild by the local diesel shop that specializes in injectors and pumps.
I had my injectors rebuild by the local diesel shop that specializes in injectors and pumps.
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- Global Moderator
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If you take the injectors out and get them tested you might not have to pay to get them rebuilt.... but if you do get them tested and find a bad one it will need to be replaced.
Yeah, $100 is alot of money.... you could probably rebuild them yourself for $45 then get the breaking pressure set for $50- $60.... otherwise you'd be lucky to get it done for $100.
I suppose it shoud be mentioned that a bad injector can burn a hole in the head,... doesn't happen often.
I'm not sure what it means when opening an injector warm changes nothing, but cold it points to a problem with that cylinder.
Yeah, $100 is alot of money.... you could probably rebuild them yourself for $45 then get the breaking pressure set for $50- $60.... otherwise you'd be lucky to get it done for $100.
I suppose it shoud be mentioned that a bad injector can burn a hole in the head,... doesn't happen often.
I'm not sure what it means when opening an injector warm changes nothing, but cold it points to a problem with that cylinder.
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'84 1.6TD Rabbit with a VNT-15 turbo, still setup to run on vegetable oil.
'84 GTI with 1.7TD pistons and intercooled.
2003 TDI wagon
2000 TDI Jetta.
Could be your cold start problem, but not your low power problem (if you really have one). Your low power problem may be because it only came new with 52HP. These aren't speed demons.kiff wrote:Well my mileage is still decent (37-40mpg) when warm it runs like a champ. Maybe a fouled glowplug?
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