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I had time off today so I installed oem computer and maf. Confirmed spark with timing light. I also pulled cam cover to check timing, which is aligned correctly. Car sputtered but didn't start. I'm assuming my 640 flow force injectors were too much for the oem ecu to handle. Plus I didnt have an O2 sensor hooked up.
Beginning to look like my new MS3 PNP isn't working. I hope this gets figured out. I've been in contact with DIY support. They've given me some suggestions, but nothing I haven't already done. Been 3 months now since the poor car ran.
Stock 1.8 injectors are 265cc if I remember correctly. The car shouldn't be using the O2 sensor readings on startup/cold idle but the 640cc injectors have to be way too much for it to handle. Do you still have the stock injectors? Would be interested to see the result with those installed.
I'm back with more issues. I put the ms3 pnp back in and took a log for diy support. I noticed that when I turn the key on my afrs show 14.7 for a few seconds, then jump to full lean. Oscillates like that. Could I have toasted my sensor by cranking so much with no spark?
Yeah, your O2 sensor is probably bad. AFR gauge does the same thing reading 14.7 then going full lean with key on regardless if engine is off or running? If so, that generally means the O2 is toast.
I got a new O2 sensor. Figured no sense installing it until I have spark, or I'll just kill that one. Been trying to deal with DIY support and they haven't been very supportive. Somebody will email me, telling me to check base timing. I tell them the whole no spark story. A week goes by, next guy says, check your injectors. It's been going on like that for a while. Finally I get a rmu, so I can return this. I sure hope they find something wrong.
Last edited by joe morreale; 04-01-2023 at 07:46 AM.
Well I finally got the beast running! I got the ecu back and after setting it up, the car fired right up. I still have the O2 issue though. I bought a new Bosch sensor and it didn't help. I could get a log to load, so I loaded a screenshot of a log. This is first drive, going around the block. You can see the afr's are fluctuating wildly. I checked for burned and pinched wires. I'm at a total loss what to do at this point. The car isn't drivable and it's making me crazy. Anybody have any suggestions what to do next?
Well the first thing I would do is take all o2 authority out so that the ecu is not trying to correct fueling based off the data coming in. If your fuel map was good before, this shouldn't be an issue.
You don't mention what o2 controller you have so the next thing I would likely do is get a new o2 controller. If you haven't already got one, the spartan by 14point7 is what replaced the innovate units on my car. I had at least three innovates but only one 14point7 in likely the same amount of time. And the innovates chewed through o2 sensors while the spartan has not needed one replaced. Even if my spartan went bad it would get replaced by another one.
I got a new AEM O2 gauge today. I don't know what I've done wrong this time but it not working right. It comes on with the the key, but shuts totally off when the car gets started. Tuner studio is reading a 14.0 afr all the time when it's running. Can somebody school me where, maybe, I should have put the wires, coming out the MS3? Does it sound like I have it wired wrong? I admit to being quite the idiot, when it comes down to electrics and electronics, so flame me if you will. If I can figure out how to disable uego authority, I will. I would like to be able to finally drive this damn thing.
7.2.6.1 Basic EGO settings These settings are used to control the behavior of the closed-loop EGO algorithm. • Algorithm - There are three options here:
– Simple - This method of closed-loop EGO control is well-suited to use with a narrowband O2 sensor. If the current AFR (or EGO voltage for narrowband) incorrect, the amount of fuel being injected is adjusted by Controller Step Size every Ignition Events per Step ignition events. This method often results in the actual AFR oscillating above and below the target.
– PID - This method incorporates a Proportional Integral Derivative control loop which tuned properly, adjusts the amount of fuel being injected to quickly get to the target, and then maintains the target without any oscillation (when tuned correctly). You tune the three proportional, integral, and derivative numbers below when this mode is active.
– No correction: The O2 sensor is used for data logging only and is not used for closed loop control.
The header for this page should say AFR/EGO control under the Fuel Settings. This can vary depending on what firmware you are on.
Oh, can't help you with the aem other than to say get the 14point7.
Confirmed that my new AEM gauge was bad. JEGS is sending me a new one. In the meantime, I copied my ignition and fuel tables from my old MS and copied them into my new tune. Turned off uego correction, as the gauge is not installed. That allows me to drive the car with a known good, safe tune. This saga of the car not running is almost over. In all I wound up having to replace: ecu, O2 gauge, 2 sets of coils (bought cheap rock auto ones that sucked), cam sensor, crank sensor, fuel pump relay and the original plugs and wires.
03-16-2023, 01:03 PM
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