89 toyota pickup 4x4 wont stay running

yotakiller · 08-23-09, 11:27 PM

the other day i was playing in the mud, i hit a really wet hole pretty hard. the truck started spitting and spudering while trying to drive. this went on for about 20 min then it started running great. about a week passes and i park my truck on a hill while at work, it starts raining really hard. then when i start to head home, it starts spitting and spudering again. but only with a load on it. i could push in the clutch and it would rev up fine. well i drove it like that for about 15 miles to an auto parts store to ask if they had any idea what was going on. they said my mass air flow sensor may have gotten wet, so we took it off and cleaned/inspected it. when i put it back on, the truck wouldnt run, at all. it was low on gas so we put some in it, just in case. that wasnt the problem either. i then removed the fuel line from the fuel filter on the tank side and turned my key on. it wasnt appearing to be pumping any fuel so i replaced the fuel pump. well now it will start and idle great for about 3 seconds then it starts running rough then dies. i have checked the ditributer, its not wet. i have checked to make sure it was firing, it is. i have taken my battery terminals off to reset the computer, it didnt help. i have a feeling it is something very simple but i cant figure it out and i dont have the money to take it to a mechanic. any ideas? it has a 3.0 ltr v6

raydouble · 08-24-09, 12:48 AM

Did your airfilter get soaked?

Have you pulled sparkplugs?

yotakiller · 08-24-09, 01:22 AM

Quote:

Originally Posted by raydouble

Did your airfilter get soaked?

Have you pulled sparkplugs?

i just bought the truck about a month before, it didnt even have an air filter in it when i checked and we pulled one plug to make sure it was firing. it was.. oh and when we pulled off the top of the aif filter housing, water poured out but when we opend the air flow sensor it didnt apear to have gotten wet

raydouble · 08-24-09, 01:32 AM

It's for a 93' but it will work...
1993 Toyota Pickup Service Manual

My first instinct would be check electrical in distributor and at coil, igniter and the VAF air meter.

Edit: coolant temp sensor also...

yotakiller · 08-24-09, 01:44 AM

Quote:

Originally Posted by raydouble

It's for a 93' but it will work...
1993 Toyota Pickup Service Manual

My first instinct would be check electrical in distributor and at coil, igniter and the VAF air meter.

ok. thanks.

raydouble · 08-24-09, 02:09 AM

Maybe check the resistance of the spark wires also.

KLF · 08-24-09, 06:39 AM

Just an FYI... turning the key to ON won't make the fuel pump run. You can force it to run but taking a paperclip and jumpering the B+ and Fp contacts in the Diagnostic connector under the hood, then turn the key ON. It's likely you replaced the fuel pump for nothing.

2ndGenToyotaFan · 08-24-09, 09:07 AM

Runs for a few seconds and dies sounds like a bad connection at the air flow meter.

yotakiller · 08-24-09, 12:47 PM

Quote:

Originally Posted by KLF

Just an FYI... turning the key to ON won't make the fuel pump run. You can force it to run but taking a paperclip and jumpering the B+ and Fp contacts in the Diagnostic connector under the hood, then turn the key ON. It's likely you replaced the fuel pump for nothing.

yea i thought about that myself. i felt like an idiot when i realized i had just thrown away $150 and waisted so much time...

yotakiller · 08-24-09, 12:50 PM

Quote:

Originally Posted by 2ndGenToyotaFan

Runs for a few seconds and dies sounds like a bad connection at the air flow meter.

i kinda have a feeling that it has something to do with air flow now like maybe it has too much air flow or when we took the air flow sensor off and cleaned it we may have messed something up

KLF · 08-24-09, 07:09 PM

How exactly did you "clean" it?

Try the paperclip thing I mentioned earlier, see if it starts and stays running.

yotakiller · 08-24-09, 10:18 PM

Quote:

Originally Posted by KLF

How exactly did you "clean" it?

Try the paperclip thing I mentioned earlier, see if it starts and stays running.

yea i done the paper clip thing today, it gave me a code 51. then before i done anything else i replaced my fuel filter. it helped alot. it will keep a good idle for about 30 seconds now but still dies. then i done the paper clip thing again, it gave me four codes, 21, 41, 51, and 52. they all point to the tps (throttle position sensor) except one that read the O2 sensor. so i bought a new tps and it didnt help so i took it back. now im lost again.. oh and to clean it we spayed throttle body cleaner in it from the bottom into the area with the metal valve/flap under the air flow sensor and wiped it down real good. then we took the two screws out of the front of the air flow sensor and slide the plug part out to make sure it hadnt gotten wet and it didnt look like it had so we put it back together.

2ndGenToyotaFan · 08-24-09, 10:25 PM

You need to adjust the TPS, not replace it. Check the FAQ for instructions.

yotakiller · 08-24-09, 10:31 PM

Quote:

Originally Posted by 2ndGenToyotaFan

You need to adjust the TPS, not replace it. Check the FAQ for instructions.

well when i checked it, the bottom screw on it was loose and it looked like it had gotten wet inside. im thinking i may have shorted out the mass air flow sensor though. any way to check this?

2ndGenToyotaFan · 08-24-09, 10:40 PM

Check the FAQ for the FSM's I'm sure there's something in there about checking the MAF... Fingers crossed!

yotakiller · 08-24-09, 10:44 PM

yea. same here. thanks.

ballinjefe22 · 08-25-09, 08:59 AM

http://personal.utulsa.edu/~nathan-b...93throttle.pdf

thats the throttle body pages. start at about pg6 and it talks all about adjusting the TPS. good luck.

KLF · 08-25-09, 10:10 AM

Quote:

Originally Posted by yotakiller

yea i done the paper clip thing today, it gave me a code 51. then before i done anything else i replaced my fuel filter.

No, I meant the trick where you jumper pins B+ and Fp, to force the fuel pump to run.

Quote:

... and slide the plug part out to make sure it hadnt gotten wet and it didnt look like it had so we put it back together.

Uh... I think this is your problem. Pulling that plug out breaks stuff inside the MAF sensor part, the section under that black square of plastic. Specifically, it messes up the contact that tells the ECU to turn on the fuel pump when the engine is running.

yotakiller · 08-25-09, 01:41 PM

Quote:

Originally Posted by KLF

No, I meant the trick where you jumper pins B+ and Fp, to force the fuel pump to run.

Uh... I think this is your problem. Pulling that plug out breaks stuff inside the MAF sensor part, the section under that black square of plastic. Specifically, it messes up the contact that tells the ECU to turn on the fuel pump when the engine is running.

well we pulled it out gently then put it back together the same way..

KLF · 08-25-09, 01:51 PM

I don't think you understand. You can't move that connector AT ALL without potentially damaging the contacts inside.

yotakiller · 08-26-09, 05:12 PM

Quote:

Originally Posted by KLF

I don't think you understand. You can't move that connector AT ALL without potentially damaging the contacts inside.

so, you think i f***ed it up?

the truck doctor · 08-28-09, 07:47 PM

Hey chris Ill see if I can find a MAF senser you can use, maybe this will work.

KLF · 08-28-09, 08:47 PM

Quote:

Originally Posted by yotakiller

so, you think i f***ed it up?

I would try to find another one and swap it on, see if that fixes it. You can take a sharp knife and cut thru that bead of sealant around that black plastic square, peel it open and see if you can find anything wrong.

yotakiller · 08-29-09, 07:29 PM

Quote:

Originally Posted by the truck doctor

Hey chris Ill see if I can find a MAF senser you can use, maybe this will work.

ok. thanks man. just let me know..

yotakiller · 08-29-09, 07:30 PM

Quote:

Originally Posted by KLF

I would try to find another one and swap it on, see if that fixes it. You can take a sharp knife and cut thru that bead of sealant around that black plastic square, peel it open and see if you can find anything wrong.

yea we done that and everything apeared to be fine. but then again, i didnt really know what to look for

Bako88 · 08-30-09, 09:58 PM

You need to be very careful about taking the top off the MAF. There are warnings that if you re-seal it, the fumes can damage the inside. Also, do not use fluid if cleaning inside the throttle body as fluid can get into the TPS and ruin it as well.

yotakiller · 09-01-09, 11:07 PM

ok, just an update. i looked closer under that plastic on my MAF sensor and aparently the guy that took the plug part out to "check it" broke a solder on one of the connections. so i relaced the MAF sensor and now it will idle for as long as i want it to. however, i cant really rev it up right now. it sounds fine to me at an idle but when trying to rev it up it starts missing then backfiring a little through the air filter and blows black smoke out of the tail pipe. my guess is, it isnt firing on one of my cylinders. guess thats where im gonna start tomorrow.. any ideas?

KLF · 09-02-09, 05:58 AM

That sounds like a timing problem to me. Try loosening the dist bolt and turning it a little bit, see if it gets better.