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Chipped p28 no cel ever

443 Views 14 Replies 8 Participants Last post by  Slow-D
i just got a chipped p28 from a guy it all worked fine in his car but in mine the cel never turns on not for the fuel pump or when the service connector is jumped its also in limp mode. The car will also cut out if i shake the ecu while the engine is running.
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Was the car running right before the ecu change? What chassis/wiring harness/engine are we talking about?
its a crx d16 turbo with a jumper for obd1 i got that ecu cause it fried my last 1 was running fine before the last one was fired.
Do you have a buddy with a running car to see if you fried the ECU again?
I would check the jumper harness pinout against both ecu wiring diagrams carefully before attempting to plug in another ecu.
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do you have a working check engine bulb? ecu fuse good? thermostat ground clean and tight?
I would check the jumper harness pinout against both ecu wiring diagrams carefully before attempting to plug in another ecu.
This has terrified me of ever doing any meaningful swaps/ mods.

How repairable are ecus that have been fried?
It would depend on what got cooked, and if the board is damaged, I'd imagine
If shaking it effects the car, the pins are loose, the wiring is goofy, or you have something shorting the ecu inside the case, loose and rattling.

It also took more than one post to say it was a d16 turbo setup.

I would run the turbo on as low boost as possible, richen up the fueling by increasing pressure to around 50-60psi, and try a stock untouched OBD1 ecu from any honda. Bare minimum, it should fire up and idle. Use that to determine of the chip deleted CEL usage, and use it to determine if a shitty alternator is ruining your day. Honda accord, integra, civic, del sol, prelude, as long as it is a manual 92-95 setup. Just avoid any ecu's from the civic 8valve or lean burn engines, their parameters can cause damage.


Loose and frayed ground wires can do this too. Make sure everything is good before fucking with tuning or turbocharging.


Too many folks on here having problems that can be solved with a good inspection and making sure they have a solid foundation before getting more power.
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If shaking it effects the car, the pins are loose, the wiring is goofy, or you have something shorting the ecu inside the case, loose and rattling.

It also took more than one post to say it was a d16 turbo setup.

I would run the turbo on as low boost as possible, richen up the fueling by increasing pressure to around 50-60psi, and try a stock untouched OBD1 ecu from any honda. Bare minimum, it should fire up and idle. Use that to determine of the chip deleted CEL usage, and use it to determine if a shitty alternator is ruining your day. Honda accord, integra, civic, del sol, prelude, as long as it is a manual 92-95 setup. Just avoid any ecu's from the civic 8valve or lean burn engines, their parameters can cause damage.


Loose and frayed ground wires can do this too. Make sure everything is good before fucking with tuning or turbocharging.


Too many folks on here having problems that can be solved with a good inspection and making sure they have a solid foundation before getting more power.
Couldn't agree more.
These cars are getting old enough now (hell, have been for awhile), that in most cases, you are Refurbishing/returning things all around the car, to proper working order, long before any sort of 'upgrades' begin.
Modding 'clapped-out' cars: Never a good idea.
clapped out cars can be great money makers though, if you have a good eye. I got a few cars over the years with odd shit going on, and something as simple as ignoring it, and treating it like a big safety inspection, found and solved more issues and got the cars surprisingly smooth afterwards.

Basics, anytime a car is new to me, it gets the brakes disassembled and greased, all fluids changed, and anything that needs adjustment, adjusted.

There goes 90% of the common problems, gone.
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I would check the jumper harness pinout against both ecu wiring diagrams carefully before attempting to plug in another ecu.
I saw a video on youtube a while ago by a guy who got a jumper harness from china that was improperly wired. That was interesting.

clapped out cars can be great money makers though, if you have a good eye. I got a few cars over the years with odd shit going on, and something as simple as ignoring it, and treating it like a big safety inspection, found and solved more issues and got the cars surprisingly smooth afterwards.

Basics, anytime a car is new to me, it gets the brakes disassembled and greased, all fluids changed, and anything that needs adjustment, adjusted.

There goes 90% of the common problems, gone.
I got my 96 Civic coupe for $800 cash non running when I had it. It needed an alternator, boom junkyard one for like $40. Then the alarm wiring was causing no starts so I fixed that, boom like $20, then basic maintenance and for less than $1000 I had a running 5 Speed coupe. Just a little bit of love goes a long way.
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I’m not surprised we’re all King of the Clapped out rides, especially upon initial purchase. It really is, the best way to save money on a build.

2020, I purchased a ‘97 Acura 1.6EL, for $220 (it was rusty, but all fixable). Granada Black with black leather interior. It had the original Y8 and A/T, Engine needed a complete rebuild.
For those that don’t know, it’s essentially an EJ sedan chassis, and only available in Canada.
I rebuilt the entire thing, every bushing/joint/bearing. My freshly built ‘Y7 and its 5 speed, the car was only short finishing rust repair and maybe a fresh coat of paint, but..
Only had it on the road a short time before I crunched it up beyond repair, it was a tough loss. They are unique little cars, despite the fact most-all the parts will infact bolt on any 96-00 Civic.

so next, I bought a completely untouched, ‘99 EX coupe (A/T), original owner, with 250k. The condition is/was Immaculate, definitely a clean slate.
Swapped everything from the EL build over, and boom here we are.
Now everytime I get near the thing with tools, I’m constantly trying not to break something original/in good condition 😂
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I’m not surprised we’re all King of the Clapped out rides, especially upon initial purchase. It really is, the best way to save money on a build.

2020, I purchased a ‘97 Acura 1.6EL, for $220 (it was rusty, but all fixable). Granada Black with black leather interior. It had the original Y8 and A/T, Engine needed a complete rebuild.
For those that don’t know, it’s essentially an EJ sedan chassis, and only available in Canada.
I rebuilt the entire thing, every bushing/joint/bearing. My freshly built ‘Y7 and its 5 speed, the car was only short finishing rust repair and maybe a fresh coat of paint, but..
Only had it on the road a short time before I crunched it up beyond repair, it was a tough loss. They are unique little cars, despite the fact most-all the parts will infact bolt on any 96-00 Civic.

so next, I bought a completely untouched, ‘99 EX coupe (A/T), original owner, with 250k. The condition is/was Immaculate, definitely a clean slate.
Swapped everything from the EL build over, and boom here we are.
Now everytime I get near the thing with tools, I’m constantly trying not to break something original/in good condition 😂
What was it like building your first engine?
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