Starts up and dies ( now with Video!!!!)

OK ... I have been battling my Riv for over a week. It started last sunday when the car started to misfire. So far I have replaced

Plug wires
Coils
ICM
Fuel ressure regulator
Fuel Pump
Crank senor
Cam sensor
PCM
MAF sensor

Car still runs terrible and misfires. Compression is 145 psi across all cylinder. LTFT are locked at +16.4. Checked all body grounds.

Any ideas?

Vac leak.

Oh I for got to mention.I wasted 2 cans of carb cleaner looking for a vac leak. Didn't find any.

Do you know for sure the MAF sensor is working correctly and connected properly?

How old is the O2 sensor?

Yes. I check for 5 volt refrence from the wire. And I also bought a new one to replace it just to be sure. and MaF readings are 3400-3700 at idle.

O2 is maybe 7k old.

Did you check your tune to make sure that the fuel trims are not reset to stock? I could see with your mods the stock fuel trims not keeping up is a possibility.

Is it just idling rough and then dying? Will it run normally under throttle in higher RPM operation?

If you accelerate slowly to 20% throttle it will smooth out. If you stab the throttle it fire on 2 cylinders . Its actuallty kinda funny if it wasn't so sad.

I reloaded my tune on thew old and new PCMs no change. I checked the setting both times,they were fine.

Did you check to make sure the plug wires were on in the right order?

How much vacuum are you pulling at idle?

yes plug wires are in the right order. ( I had it checked by 3 mechanincs on 3 seperate occasions )

Pulling 19-20 Inhg at idle.

You pulled and inspected/replaced the spark plugs? (didn't see it in your list)

did you correctly compensate for the larger injectors?

AA wrote:

did you correctly compensate for the larger injectors?

Good point. That high LTFT tells me something else is wrong. MAF Table or IFR table gone awry...

Pulled and inspected all the plugs. they aren't 2k old

Injector tables were checked before uploading to the new PCM.

I once had +16.4 LTFT. It was caused by a combination of a cracked vac line and a faulty AFC device ran inline with the MAF wiring. I think the AFC was causing most of the problem.

Might try disconnecting the MAF sensor and see if anything changes.

I disconnected the MAF sensor. No change

video to show what it does.

I wish I was knowledgeable enough to help diagnose this. I did look around the Internet for other people who have had the same issue. Here is something I found on a Ford site. Maybe it will help:

"Truthfully there are many things that can be wrong. You need to narrow it down, because you are either loosing fuel supply, fuel injector pulse, or ignition spark. You need to make it act up, and check for spark. If you have spark, you know it is fuel. If you have no spark, you know it is ignition. If it is spark, you may have a faulty ignition module, pickup coil(stator), or ignition coil. If it is fuel, you may have a faulty fuel pump, PCM, PCM relay, fuel pump relay, or I have even seen a bad PCM ground at the battery cause this. The PCM ground wire is the small ground wire coming off of the battery ground. I hope this helps, but I can say that the most common problems with this car are: Number 1-fuel pump, Number 2- ignition module, coil, and stator, and Number 3- PCM ground wire."

i honestly just re place all the vacumm lines, and see if it does anything at all

I replaced vaccum lines 6 months ago. checked them all again . No leaks.


I will check the PCM ground on monday thanks steve98

Double check the wiring to the crank and cam sensors?

if your riv had, say, 150,000 miles or more then replacing the crank & cam sensors is a good bet.

Put it to you this way - if you're reading this, you have 150,000 or more miles (NOT Km) and you have not had to replace your crank sensor, let us know...

Albertj

deekster_caddy wrote:

Double check the wiring to the crank and cam sensors?

Yep checked it when I replaced the cam and crank sensors.

hook up a scanner that can show a live datastream for the cam and crank sensor and see if they produce good signals

maybe you need to put the old PCM back on, or get a used known good one.

I apologize for my crank / cam sensor post. Re-read the first one, says you replaced it already. THere is a chance it is bad new but if you bought a decent brand that's not likely.

Albertj

My Riveria is dead.


I am not going to type all the details if anyone is interested read the thread here

http://www.bonnevillepro.com/forums/viewtopic.php?f=28&t=5901


Thats why i haven't been on much latley