Hey guys, so I give up. I’ve searched and searched for sometime now. I have been reading and trying different fixes or ideas here on the forum. Been asking a few other 80 series owner buddies of mine, but now I gotta post a thread.
As a few of you might know, I have a 91 FJ80. 250,569 on the clock. New starter (replaced around Sept. 2022), alternator replaced (2017), o2 sensors replaced (2019), egr seems to be working fine because I don’t notice any change in idle speed on cold starts. Good positive terminal connections. Redid my ground wire to the chassis.
Here’s the problem. Every now and then, I’ll have problems starting the truck after driving. I thought maybe it was a weak alternator, but checked with a voltage meter, and with the truck at idle, I’m getting 14.6V to the battery. Thought maybe my battery wasn’t holding charge, so I had it checked at autozone. Turned out it was a bad batt. Replaced with a yellow top optima. I’ve had the CEL on for about a month now. Paper clip told me it was a code 25/26.
What’s weird is that when I’m having trouble starting the truck, I attach my jumper on it, and it’ll fire up after a couple cranks. The thing is, even with the new battery, I’m getting good strong long cranks. Doesn’t sound weak at all. The engine just isn’t turning over.
When it runs, it runs very smooth. Idle is about 900 rpm. Don’t feel any bad hesitation on acceleration. Even with the code 25/26.
My question is, should I chase the code 25/26 down first? Or does this sound like a battery issue?
to me, it feels like the engine may have a vacuum leak based on how good it cranks, but then why would it start right up when a jumper is on it? Can’t emphasize it enough, really strong cranks.
As a few of you might know, I have a 91 FJ80. 250,569 on the clock. New starter (replaced around Sept. 2022), alternator replaced (2017), o2 sensors replaced (2019), egr seems to be working fine because I don’t notice any change in idle speed on cold starts. Good positive terminal connections. Redid my ground wire to the chassis.
Here’s the problem. Every now and then, I’ll have problems starting the truck after driving. I thought maybe it was a weak alternator, but checked with a voltage meter, and with the truck at idle, I’m getting 14.6V to the battery. Thought maybe my battery wasn’t holding charge, so I had it checked at autozone. Turned out it was a bad batt. Replaced with a yellow top optima. I’ve had the CEL on for about a month now. Paper clip told me it was a code 25/26.
What’s weird is that when I’m having trouble starting the truck, I attach my jumper on it, and it’ll fire up after a couple cranks. The thing is, even with the new battery, I’m getting good strong long cranks. Doesn’t sound weak at all. The engine just isn’t turning over.
When it runs, it runs very smooth. Idle is about 900 rpm. Don’t feel any bad hesitation on acceleration. Even with the code 25/26.
My question is, should I chase the code 25/26 down first? Or does this sound like a battery issue?
to me, it feels like the engine may have a vacuum leak based on how good it cranks, but then why would it start right up when a jumper is on it? Can’t emphasize it enough, really strong cranks.
