How do I tell if 5 weak injectors or a weak pump?

My car seems to run a little shakey at idle with a slight miss on some of the cylinders. If I turn the idle up to 1000 RPM's it's smooth as a top. My guess is it's not spraying a good strong mist at a low RPM. Weak ip or injectors?

I pulled the number one Injector out of the head and put the line back on and started the car and didn't notice any spray out of it but it was right next to the hole it goes in (number one pre-chamber) and the breeze coming out of that cylinder may have made it hard to see the injection spray. Is there a good way to test the injectors. No shop within 45 minutes or so.

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-E300d '99 350k
-Suburban '93 220k
-TDI Jetta '03 350k
Sold
-F250 '96 7.3
-Dodge Ram 12V
-E320 '95 200k
-E320 Wagon 1994 155k
-300d Turbo '87 187k miles
-E320 1994 200k
-300d Turbo '84 245k (sold to Dan62)
-300d Turbo '84 180k
-300sd '80 300k
-7.3 Powerstroke Diesel 15P Van 500k+ miles
-190d '89 Non Turbo 2.5 5cyl 240k (my first MB)
Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's.

With 300K miles, check your chain timing. If the chain is elongated it will cause the valve and injection timing to be retarded by the same number of degrees. If it's 4-8* elongated then you can install an offset cam key and reset your injection timing to get back alot of lost power. If it's more than 10*, it's time for a new chain.

homemade poptester

check this out...

I was gung-ho about the homebrewed pop tester until I saw the caution and the hand that resembled hamburger.

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DJ


84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012

yeah, well dont use diesel, and dont put yer finger in front of a 2000psi nozzle.

agreed, it is not for the novice...

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.

I wasn't planning to stick any fingers any where near a spraying injector. My worries are more with the thing I would build. With my luck it would explode in my face.

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DJ


84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012

The SD? If so you may want to adjust, or replace the Rack Damper bolt. It resides on the back of the IP, just in front of the oil filter canister. Do this with engine at operating temp while running. 14mm lock nut and a 12mm adjusting bolt. Loosen lock nut, back out screw till you have a smooth idle. I had the same problem on mine (SD), replaced bolt with a gold colored one, worked fine for a few months, had to pull bolt and re-seat "o" ring. Problem solved. The spring in those bolts wear out over time. This is far less trouble than dealing with the IP. The best way to determine if the injectors are working properly, is to have them tested, preferably at a Bocsh authorized shop, or just about any place that works on diesel trucks. Hope this helps.

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83 SD

84 CD

I did take 5 inj that I pulled out of a junkyard into a mom and pop diesel shop(http://www.dieselandimport.com/) here in the metro. they tested them for me, all were good. they wouldn't even take my money.

a while later I needed a few heat sheilds, as 2/5 of the ones from autohauzaz didnt seal, and they only charged me $4 for 3 of them- cheeeper than anywhere else I know of.

needless to say, they now have my business(if I ever get in over my head)

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.

Thanks for the info about diesel import. Blaine Mn might be worth a road trip for me. Have been thinking about getting my inj tested.
Thanks

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-Arthur C. Clarke

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--John Wayne.

OBK member#16
77 300D
75 300D (rusty parts car)
73 220D (Dad's)
98 Jeep Grand Cherokee
82 Kawasaki M1