280 2.5

**Skater Mike** · 09-28-2014, 09:45 PM

I have a 2001 mer 280 keeps fouling all the plugs , runs good until you shut it off and restart, takes all the plugs out champion QL 77 cc any ideas

**Go Time** · 09-29-2014, 06:13 AM

Wrong plug...try NGK BPZ8H-N-10 gap @ .035 (I think thats what the N-10 means)

**Michael J Giesler** · 09-29-2014, 06:54 AM

Mike when was the last time the injectors were done might be time

**capteliminator** · 09-29-2014, 08:56 AM

I run the champions in my 280 and have zero problems. Without a DDT its hard to say. I would start with cleaning injectors but if its fouling all of them I doubt that's it. Could be air temp sensor or map sensor.

**jasonpijanowski** · 09-29-2014, 09:02 AM

When there having a fouling problem that is a problem been there and never could cure it...

**Go Time** · 09-29-2014, 10:31 AM

I think if your going to run champ, your suppose to run the QL77PP. I agree that a bad sensor (temp or map) can also cause the ECU to go to a rich condition. Definitely should get a DDT to read the sensors and check injector signals. You may want to check your fuel rail pressure too.

**h2oskiier30** · 09-29-2014, 10:54 AM

I run QL77JC4 in mine. No problems.

**Skater Mike** · 09-29-2014, 08:48 PM

injectors all new ,try new gas and plugs -- this weekend

**Euroski** · 09-30-2014, 06:22 PM

If you have a Merc manual it tells you how to check the sensors, TPS sensor, etc.

**BUZZIN' DOZEN** · 09-30-2014, 07:21 PM

Originally Posted by Euroski

If you have a Merc manual it tells you how to check the sensors, TPS sensor, etc.

Need a DDT to check the tps

**Euroski** · 09-30-2014, 07:35 PM

Originally Posted by BUZZIN' DOZEN

Need a DDT to check the tps

When I had my 280 I made an adapter and checked it at the TPS with an digital voltmeter. TPS has 3 wires supply voltage of 5v and feed back to ECU. Can't remember what the 3 wires does... sold the 280 back in 2004.

**Skater Mike** · 10-01-2014, 02:44 AM

Need to buy a mer 280 book somewhere

**Go Time** · 10-01-2014, 06:07 AM

I found my 280 factory service manual on Ebay cheap...Part no.90-840151 I think

**john w** · 10-02-2014, 10:09 PM

Originally Posted by jasonpijanowski

When there having a fouling problem that is a problem been there and never could cure it...

Been there, done that. On the Ngk and the Champs.

**Djohns** · 10-03-2014, 08:33 AM

I have a 2000/280/2.5L. I'm sorry champion plugs are for lawn mowers. Not for Mercs. I have run them both. NGK far superior. The key to avoid fouling is proper fuel mixing, fuel curve and reduced idle time in my opinion. I have had great success with Pennzoil full synthetic at 40:1. Buy a DDT!!!! You will not be sorry. I found mine on this site years ago for $600 dollars. When my engine starts to mess up I hook up the DDT and it tells me which cylinder is miss firing. No guess work. Replace the individually plug and move on. The DDT has been an out of pocket life saver. 80 to 100 bucks at the dealer just to hookup if they even know what a 280 is. been there. ps. These motors are setup rich from the factory and by using the DDT I set the fuel curve 1 below stock. In our case -1. Cheers Dave

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