diagnosis

I have been chasing this issue for a while now. It would go in and out of functioning so in this hot summer I left the AC on before it went out again and looks like it’s gone for good. Thankful my AC settings are remembered. I’ve tried unplugging each module related to see if it’s isolated to...

I'm trying to diagnose a cold engine low rpm hesitation issue under load (acceleration). To rule out the IAC, I've completed an ohm test on the IAC pins, they check out fine according to the FSM. I'm not able to remove the IAC at the moment, but I have live from the TOYOBD1 app. I get data from...

Left town for a week for work, but on the way to my buddy's house, I'm sure I blew the head gasket on the 80. I'll be able to diagnose it better when I get back this weekend, but at the moment I'm car-less. The initial thought is since I'm leaving the country in a year and already have a...

I went to do a simple oil change yesterday, pulled the underbody guard and noticed what appears to be a leak at where the CV meets the Diff housing up front on the passenger side. I am guessing this is a seal on the Diff housing side and not the CV but am looking for the IH8MUD (aka. expert)...

This morning as I was taking my daughter to school I turned the heater on and realized after about 20 minutes that the air was blowing cold. I turned the temperature to the highest setting and that did not help. I read a few forums and decided to run the diagnose on the AC system. I got code 21...

I have noticed a coolant leak around the transmission after having done a lot of work on my new to me 2015 200. You can see what I've been up to in my Build Thread, but short of it is that I have swapped transmissions and transfer cases and all of the front mounted engine accessories between...

I've been lurking on here and I decided to join up. I have a 1984 that the PO tore apart and 99% kept in boxes or bags. They block, crank, and head are at a local machine shop getting verified for a rebuild or if they are boat anchors. I did find a burnt valve with the top end stuff. Four valve...

Hi, could use some help diagnosing an issue on a 2001 with a TRD supercharger running a Unichip piggy back controller. It ran fine for years and thousands of miles, then started throwing codes for throttle position sensor failure, P0120/P0121. My son has been driving it for the past couple of...

Hi all, I need some help with a horn on all the time issue. I'm brand new to this forum, and brand new to these cars. I just on a whim picked up an '04 Lx470. The car I picked up is in good shape, but has a few electrical gremlins. The horn is on all the time, so the previous owner pulled the...

I need help from the collective diagnosing a shuddering issue on acceleration and under load I am having with my 92" 80 series. I have combed through the forums and thought I had found the solution a bunch of times...but no joy yet. She is a 92 so 3F-E engine & A440f 4 speed auto tranny. On...

Got P0037 code and replaced both downstream O2 sensors with Denso. Code came back on and took to my local shop but they were unable to diagnose and suggested going to dealer who may have better diagnostics. Any ideas before trying to navigate stealership nightmare?

I've had a time getting some new front end noise dignosed after a "friend" put on new struts to replace the 10 year old ones on my wife's Honda Odyssey. I've struck out twice with what I thought were decent shops, but am looking to get the mud hive mind experience if possible for reputable...

I can't believe I'm posting another catastrophic failure thread, but...here I am. For those not in the know, I recently had an inexplicable H55f failure, remedied by a new unit built by @cruisermatt, which due to the freight company (YRC Freight)'s careless treatment, took two tries over two+...

Pretty sure there’s no way to diagnose this over the internet, but looking for things to check. 1992 LC, runs perfectly till I get to operating temp then I get a really low idle like it wants to stall… any ideas of where to start would be appreciated. Plugs and wires are new, so I can skip those.

This is front passenger wheelwell

Please help diagnose my AC problem. I have searched and read many threads with similar issue. This seems to be a common problem, however I cannot find a resolution. What should I try next? The car is a 2002 LX470 (with rear AC) with about 144k miles, it has been in my family since new. It spent...