Will start and (sometimes) idle, but not rev
- Thread starter nickj
- Start date
Terry, Got tied up at work. Will be headed back into the engine bay tomorrow. Started the truck on Friday to see what it'd do, let it come up to temp, got it to respond to the accelerator properly once, and noticed that it was flashing the CEL, and promptly turned it off. Will be pulling the codes today. Hoping it's something like 'ckps intermittent' or similar.no694terry said:
was the engine pressure washed at all, just a thought but maybe you sucking up some water that got into the intake if the yard cleaned the motor at all. most yards i've been to will pressure was engine/transmissions to make them look better. flashing cel has always been a water related misfire in my cases. again just a thought
'no694terry said:
Interesting thought. I don't know if the yard did, but I did (making sure to be careful of any and all wires). the only way into the intake I can think of is the TB, and I taped over that (and any other openings). That wouldn't cause the popping in the intake though, would it?
I have two standing by -- one on loan from a parts car, and one off of the old engine (which ran well enough to snap the cam in 3 places...)singingcamel said:
That's what I'd think.no694terry said:
I also got in my OBD2 reader today (an ELM327-based device). Also, the TPS and coolant temp readings seem correct -- 60-ish degrees for coolant, and TPS responding how you'd expect. It said it was also running about 5* of advance.
Here's the codes:
- P0102 Low MAF Input
- P0135 O2 Sensor heater circuit malfunction (Bank 1 Sensor 1)
- P0150 O2 Sensor circuit malfunction (Bank 2 Sensor 1)
- P0155 O2 Sensor heater circuit malfunction (Bank 2 Sensor 1)
- P0300 Random Multiple Misfire
- P0304 Cylinder 4 Misfire
Also, it started right up and did the rough idle thing, and it's rather cool today -- 35 high and snowing.
The pre-cat sensors are not as important as the post-cat. When they default to .5, you typically run rich and your MPG's goes down. They'd be worth fixing. Will Tillery has a good deal on new ones.
I doubt this is causing your issues, though. P0150 would be the more severe, but I doubt it's the root of your problem.
If you can get the engine to rev, sometimes, it's probably not a timing issue. It's possible you have a bad plug wire, or two, but I'm still betting on a fuel pump.
I doubt this is causing your issues, though. P0150 would be the more severe, but I doubt it's the root of your problem.
If you can get the engine to rev, sometimes, it's probably not a timing issue. It's possible you have a bad plug wire, or two, but I'm still betting on a fuel pump.
My money is on MAF sensor. Same experience once when a fellow offroader took water into the MAF sensor. Backfires, popping, would rev but took some work to get it up there.
Did you try another MAF sensor?
Did you try another MAF sensor?
i had 3 out of 4 O2 sensors completely shot and pinned at 1 volt on my scanner, i might as well have unplugged them all together but my truck still ran moderatley well. The scanner i had couldn't read my MAF voltage which i didn't know at the time so when mine was running bad i tried 3 MAF sensors before finally getting my cam sensor code. maybe your ecu is having a bad day. somethings got to stick
I've swapped MAF sensors, but not necessarily with a known-good one -- this one just doesn't throw codes the same as the one that came on the truck.d1driver said:
MAF reads at around .5lb/min inflow, and after clearing the codes, the truck was idling down in the 300-600RPM range.
If it were the sensor, the truck should run somewhat decently unplugged as well, right? -- I seem to recall that it defaults to near sea level air intake, based on rpm and no vacuum leaks. Specifically, I should be able to rev, if a bit rich.
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D Chapman said:
I'm running the stock cam -- this engine came out of an '01 with SAI, mine is an '02 with SAI.
Pull the cam sensor and make sure the tip is not broken off.
Same with the crank sensor.
I still think it's fuel pump, though.
Same with the crank sensor.
I still think it's fuel pump, though.