Fuel Injector Going Bad?, FIXED - Thanks 914 World! |
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Fuel Injector Going Bad?, FIXED - Thanks 914 World! |
saigon71 |
Jun 10 2015, 07:32 PM
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#1
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Advanced Member Group: Members Posts: 2,000 Joined: 1-June 09 From: Dillsburg, PA Member No.: 10,428 Region Association: MidAtlantic Region |
74 2.0 D-Jet. Car is in a fine state of tune. Verified fuel pressure at 30 PSI. Removed distributor, cleaned & lubed advance plates and tested vacuum canister. Verified TPS is set correctly. MPS tested fine. ORIGINAL fuel injection harness. I went around the engine bay today and re-seated all FI related connections. The injectors are in unknown condition - came with the car.
This is different than the bucking I used to experience. I intermittently have a cylinder drop off. It happens at all speeds, but is really noticeable at idle. I had it running for a while in my driveway tonight and the exhaust fumes spelled especially "gassy." When it's not missing, it runs fantastic and idles perfectly. I think I have a fuel injector going bad. Can they fail intermittently? Anyone else experience something like this? I figured I would just pull all four injectors, run the fuel pump and measure the fuel...but I'm not sure I could find the faulty one if it functions correctly during the test. Pretty boring video (IMG:style_emoticons/default/dry.gif) Engine starts running rough intermittently at :40 (engine bay sound) and 2:07 exhaust. https://www.youtube.com/watch?v=xQoMS-NeOag...eature=youtu.be Any advice is appreciated. |
saigon71 |
Jun 28 2015, 02:24 PM
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#2
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Advanced Member Group: Members Posts: 2,000 Joined: 1-June 09 From: Dillsburg, PA Member No.: 10,428 Region Association: MidAtlantic Region |
I believe I have eliminated everything but the ECU and the FI harness at this point - please let me know if I've missed anything as my next step is a Blowsby FI wiring harness:
Injectors cleaned & tested by Mr. Injector. The worst one was only 10% flow deficient, so I had my doubts that the injectors were the problem. Installed the fresh injectors and still have the same problem. Inspected inside fuel tank for debris and condition of fuel sock - all looked very clean. Swapped out relay board - no difference. Swapped out cap, rotor, points & coil individually - no change. Inspected all fuel lines (including under the tank) for kinks. Fuel pressure spot on at 30PSI Props to Mr. Injector. Total turn around time, including shipping was 9 days. Injectors came back cleaned & inspected with new FI seals, FI hose clamps, lengths of hose and documentation on how the injectors tested. A true value at $17 per injector. |
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