switching to 3.8l coils $8B

[BigBanks78]

Hey everyone.

The stock Quad-4 coils r getting hard to find so thought I would try a couple 3.8l coils. I hooked em up and they work but the idle is high 1200rpm and its pulling the idle timing down from 17 to 10. it has a code35 Idle Improper but was already there and the light is normally off with the red dot by code 35 in the list. now the CES light is mostly on. Is there anything I can change to get these coils to work like latency in $0D? Or maybe they are not compatible with the 8707 ecm? Seems like the timing is high across the rpm range.

Any suggestions would b greatly appreciated

[1project2many]

Hello,

I switched a Q4 to DIS style coils several years ago by using MSD coil adapters. It worked great and solved an issue that involved one coil repeatedly failing. I didn't change the tuning at all.

Have you looked for signs of a vacuum leak or IAC issue? Is that IAC working?

do you have tools to read and program chips? You can find 3.8 /3800 coil latency values in a calibration from one of those engines. Transfer them to your 2.3 calibration.

[BigBanks78]

Hello,

I switched a Q4 to DIS style coils several years ago by using MSD coil adapters. It worked great and solved an issue that involved one coil repeatedly failing. I didn't change the tuning at all.

Have you looked for signs of a vacuum leak or IAC issue? Is that IAC working?

do you have tools to read and program chips? You can find 3.8 /3800 coil latency values in a calibration from one of those engines. Transfer them to your 2.3 calibration.

Ok so I picked the one bad module out of several. Changed it this morning and that fixed the issue. I looked for the latency scaler and did not find anything labeled "latecy" in the bin. The bin im using, ANMS, is not as defined as the low output anmp so it may not b there. ill have to look in the anmp bin for the latency. I did look at $5B supercharged but no latency there either. all good, i took car of the rare coil issue and the stupid plastic spark distribution cab.

Thank u!!

[1project2many]

Isn't that the way?

Which coils are you using? The 86 turbo Buick 1227148 lists a single value for spark latency.

$0D which is equal to .013 ms.

HTH

[BigBanks78]

Ha yea Im not sure the exact model but I found a chart that said those coils were used from late 80's to mid late 2000's wasn't boosted in any way. i just looked at the supercharged bin cuz it was the first one I could find that may have those coils. I have a dozen or more from throwing away a car every now and again. maybe this weekend I can compare some more stuff but I gotta figure out that high idle thing, now its idleing 14-1500 while rolling clutch in. hoping i cut the o-ring on the idle valve or ill b at pull a part tomorrow, cant find one local and not sure I have another that fits this offset bolt hole..... The engine seems like its had a couple degree timing added with these coils, knocks a 4000 heavy throttle. Thought I would try dropping the whole map 1* until I can concentrate on it see what happens.
Most common thing i see those coils on is a buick lasabre front wheel drive 3.8l. Chart said those coils were used on almost all the DIS 4 and 60 and 90* v6. I found the chart on the internet sooo Im not claiming 100% true

[BigBanks78]

ok I looked at the other bin, they r the same as far as i can tell. Same as in # of pid's i guess.. I slept sense then. I lowered the iac position temp offset vs cool temp and it responded in kind so maybe I need to adjust those a bit?? It's a HO 2.3, I tried to keep the engine stock so I didn't have to change much in the bin but I ported a small exhaust port head to a large (Ive cracked a couple) and cleaned up the rest and used the stock 4-2-1 LO header, its steal tube, pretty cool sound. Just left it after 9 months of cobbling together parts. Stuff was lil hard to find. I plan to make a long tube 4-1 header, heard they worked well with the big cams but it runs pretty freaking good, at the right outside temp. I also lowered all the idle, Main and PE spark tables 1* and that seemed bring the power back, Im going to lower them another in a day or 2 of driving. the knock is gone as well.
Geez didnt ask if i need to Change the IAC tables at all, if that would b normal? I did look everything over, didnt find any air leaks

Hey I appreciate it and the site :)

[BigBanks78]

Oh and no latency anything. Maybe change spark bias table instead of the ones I did? Im feeling my way thru the dark on a lot of the bin.

[1project2many]

Chart said those coils were used on almost all the DIS 4 and 60 and 90* v6.

Latency for those coils is available. Shows in one calibration as 153 ms or $000A. What calibration are you using? I may be able to match code to find the latency value.