 74' 1.8 #2 is not firing?, asking for a friend |
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| Type 47 |
 Aug 30 2026, 08:34 PM
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#1
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Senior Member  Group: Members Posts: 809 Joined: 1-June 10 From: St. Louis, MO Member No.: 11,790 Region Association: None 
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L jet
original FI also, installing an 123/Ignition distributor. what is next step?  |
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| Superhawk996 |
Aug 30 2026, 08:48 PM
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#2
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914 Guru Group: Members Posts: 8,031 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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Need to determine what is missing the fuel or the spark
That plug on the bottom has previously fired as witnessed by carbon on threads and residue on electrodes but it also looks extremely lean. If I were betting I’d put money on a clogged injector but you need to verify what’s missing and not trust a hunch. |
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| Ninja |
Aug 30 2026, 09:12 PM
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#3
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Member Group: Members Posts: 295 Joined: 25-September 25 From: Granbury Texas Member No.: 29,004 Region Association: Southwest Region |
Not enough info yet...
What do the other plugs look like? Does the fouled plug have a gap? Hard to tell in picture. But, without any info... Compression test Ignition spark intensity test, color of spark across a 1/4" gap Try another plug Fuel tests, pressure, air leakage, maybe fuel quality (if old with alcohol in it). Injector spray pattern tests I agree with the Hawk, the lean plug would bug me. How long has it been in? When is the last time the car ran well? |
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| Superhawk996 |
Aug 30 2026, 09:37 PM
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#4
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914 Guru Group: Members Posts: 8,031 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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(IMG:style_emoticons/default/agree.gif)
All good points In the end what you have there are two plugs and neither looks normal. One fouled rich One running lean |
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| Type 47 |
Aug 30 2026, 09:50 PM
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#5
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Senior Member Group: Members Posts: 809 Joined: 1-June 10 From: St. Louis, MO Member No.: 11,790 Region Association: None
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took plugs out and all were sooty, except #2.
took plugs out, emery clothed them, put them back in and same thing. all sooty, except #2 clogged injector is a good thing to check! |
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| JeffBowlsby |
Aug 30 2026, 10:06 PM
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#6
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914 Wiring Harnesses & Beekeeper Group: Members Posts: 9,349 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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Being Ljet, be sure to check that all 4 wires on the resistor pack are intact on their resistors, and the harness grounds are in fact , well connected to ground.
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| Type 47 |
Aug 31 2026, 05:40 PM
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#7
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Senior Member Group: Members Posts: 809 Joined: 1-June 10 From: St. Louis, MO Member No.: 11,790 Region Association: None
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QUOTE(JeffBowlsby @ Aug 30 2026, 08:06 PM)  Being Ljet, be sure to check that all 4 wires on the resistor pack are intact on their resistors, and the harness grounds are in fact , well connected to ground. OK will check next time I have a chance to go over to where the car is. So I'm assuming L jet has tendencies to have ground issues, or am I reading too much into that? |
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| JeffBowlsby |
Aug 31 2026, 08:13 PM
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#8
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914 Wiring Harnesses & Beekeeper Group: Members Posts: 9,349 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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Not ground issues per se, but the injector wire attachments to the resistors are a known weakness, taking out each injector associated with a wire break.
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| StarBear |
Sep 1 2026, 06:05 AM
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#9
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Advanced Member Group: Members Posts: 2,365 Joined: 2-September 09 From: NJ Member No.: 10,753 Region Association: North East States
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Had that a while ago, also on #2. The contact on the inside of the dizzy cap was dirty, so no spark. Cleaned it and all ok.
Still the over rich condition, too. Inside cap cleaning wouldn’t hurt that either. |
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| rfinegan |
Sep 1 2026, 07:15 AM
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#10
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Senior Member Group: Members Posts: 1,212 Joined: 8-February 13 From: NC Member No.: 15,499 Region Association: MidAtlantic Region
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swap 1-2 injectors and see if the problem follow the swap to 1..
no cost and can be done wit simple hand tools it 10-15 mins do you hear it miss firing? duh, duh, duh, duh....etc |
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| Type 47 |
Sep 1 2026, 08:51 AM
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#11
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Senior Member Group: Members Posts: 809 Joined: 1-June 10 From: St. Louis, MO Member No.: 11,790 Region Association: None
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QUOTE(StarBear @ Sep 1 2026, 04:05 AM) Had that a while ago, also on #2. The contact on the inside of the dizzy cap was dirty, so no spark. Cleaned it and all ok. Still the over rich condition, too. Inside cap cleaning wouldn’t hurt that either. new cap |
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| Type 47 |
Sep 1 2026, 08:52 AM
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#12
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Senior Member Group: Members Posts: 809 Joined: 1-June 10 From: St. Louis, MO Member No.: 11,790 Region Association: None
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QUOTE(rfinegan @ Sep 1 2026, 05:15 AM) swap 1-2 injectors and see if the problem follow the swap to 1.. no cost and can be done wit simple hand tools it 10-15 mins do you hear it miss firing? duh, duh, duh, duh....etc great idea! |
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| L-Jet914 |
Sep 2 2026, 06:54 PM
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#13
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Member Group: Members Posts: 421 Joined: 24-October 12 From: Davis, CA Member No.: 15,080 Region Association: Northern California |
If you have access to noid lights, you can connect one to #2 injector connector. Disable fuel and crank the engine over and see if the noid light illuminates. That will tell you if it's activating that injector.
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