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matt

matt 4/16/2019

1992 Buick Regal Limited 6 Cyl 3.80L

Engine

First, it's 6cyl 3.8l,engine misses when accelerating

I've done basic tune-up, spark plugs (checked gaps.60mm),wires, fuel filter, checked fuel pump,oil,oil filter and air filter. Running good,starts fine but begins missing while warming up. Then while driving, anytime I have to accelerate or while switching to overdrive it stumbles bad until I'm up to speed. Basically anytime I hit accelerator it starts stumbling and misses until it gets up to speed or road levels out. I hope my story makes sense. Thank you in advance if any help can be provided.

2 Answers


Jimm

Jimm 4/16/2019

First question - what exactly is the spark plug gap? Should be .060" or 1.5 mm.
Next question, is there a check engine light or warning displayed? Even if not, have the on-board diagnostics (OBD) system scanned - for free - at any local auto parts stored.
Then, post a reply with the specific code for further assistance.

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Jimm

matt 4/16/2019

No check engine light on, found scanner and code12 keeps repeating. Reset the ECM pulling fuse and following directions but still just code 12. Had ECM replaced two years ago. Sorry and correct, the Gap is.060. Thank you for your time and consideration. 👍

Jimm

Jimm 4/17/2019

GM Code 12 = No Distributor Pulses. Trouble Code 12 is a special case code that is not logged into the ECM's Non-Volatile Memory (NVM) when detected. When the ignition is ON and the ECM detects no ignition reference pulses coming from the ignition module, it illuminates the Service Engine Soon lamp.

Code 12 is also used when the ECM is in Diagnostic mode (ALDL Terminal B grounded, key On, engine Off) to signal the beginning or end of a so-called 'diagnostic sequence'. This is when the ECM enunciates each stored code using the instrument panel Service Engine Soon lamp.

When in this mode, the ECM will begin by flashing code 12 (on the lamp) 3 times. This indicates the beginning of a diagnostic sequence. It will then flash any codes stored in NVM 3 times each before proceeding to the next code. When all stored codes have been displayed, the ECM will again flash code 12 to indicate the end of the diagnostic sequence. The cycle continues as long as the ECM is in Diagnostic Mode.

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Jimm

matt 4/17/2019

Ok, I will use the scanner again. The scanner model's name is Sunpro by actron. GM 1982 & higher - CP9001. It has test above the switch for either ABS/ENGINE. I'll give it a go and note any new codes after flashing 12- 3times. That's what it's shown when I used it first couple times. Thanks again, hopefully I get something to work with,lol. Steady as she goes.

Jimm

matt 4/17/2019

Unless you meant the problem is "no distributor pulses" but I'll figure it out. Thanks

Jimm

matt 4/20/2019

thanks again Jim. I purchased an ignition coil a week ago thinking the problem was related but didn't install immediately. after your comment about distributor pulses I decided to try it. I used a multimeter and the 5/2 coil wasn't showing the ohms but 4/1 and 6/3 wre showing 5.77 so I installed the coil on the 5/2 reattached spark plugs and it's running great. I'm thinking of replacing 6/3 now due to it starting to have irregular reading. probably one inconventional method of many I've done,lol

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