90-93 vs 94-96 PLENUM HOSES.

[elwesso]

This poll is applicable to anyone who's changed the original plenum hoses on their Q (which by now it should be most everyone)...

Ive worked with 3 94s and all of them (on original hoses) seemed to be fine.. They seemed to be pliable and overall really nice.. On the flip side, ive worked with 2 90-93s and all of the hoses were like metal.

My Q had 120k when I did the plenum, this other one had about the same. On the flip side, the other 90-93s I worked on were at similar or less mileage.

As I was helping Lino with his plenum hoses, he was telling me that every single one of them broke and were all like metal and broke into millions of pieces when removal was attempted.

This made me think that maybe for 94 they redesigned the hoses.. Im unconvinced that across the board 4 years max would make that big of a difference, to go from at least usable to useless. Every 94-96 Ive dealt with personally has had decent plenum hoses, and I recall talking to some people on there that their plenum hoses were OK. If one went 12 years and are still close to new and the other went 14 and they were done for, that seems a little fishy?

I recall the 94 saw over 1000 new parts over the 90-93 and IM wondering if a batch of plenum hoses might be in that mix...

Just another drop in the bucket for the 94-96..

[maxnix]

Mine seemed pretty good, but still changed them. I'll cut some open and investigate further.

[qship96]

Having my 96q Plenum hoses done by T3 last month for the first time ever{201,000 miles} the 2 fat,short coolant hoses above the KS were seeping coolant only in winter startup{had been for a few years}.

Fuel hoses never leaked,and air hoses were still pliable-T3 returned a few new air hoses that I brought,saying the original ones were still in very good condition and didnt see the need to replace them?

[3Q Jay]

no experience on a 90-93, so no comment, but silver (94) had nice plible hoses at 105k and exactly 12 years (aug 2005). the one exception was the right angle brake booster vac hose on back of spider. that thing crumbled.

there were 1 or 2 near the pcv that were overly soft.

[superuber]

When I did mine at 85K I was asking myself why? I even skipped some of them they were that good. My valve covers were another story.

[elwesso]

there were 1 or 2 near the pcv that were overly soft.

Interesting you mention that because on the 90-93 I worked with the oens you're talking about were rock hard.

[ddrumman]

I just had mine done at the dealer. The receipt shows that they replaced:8 (gasket-intake manifo) part# 14032-60U01 and 3 (hose-water) part#s 14056-60U05, 14056-60U00, 14056-60U04 respectively. Is that all that needed to be changed?

I don't know what kind of condition the ones they took out were in.

[sdkhalsa]

I know that this is blasphemy, but on my 94 Q(116K), I custom fitted my own from standard radiator hose, heater hose, vacuum hose, and fuel line. Every time I have pulled the plenum, I have replaced more and more of the hoses. This includes the two large transfer coolant hoses, all of the small coolant hoses, some of the fuel lines(would have done all of them in hind site), and virtually all of the vacuum lines.

Other things replaced: O2 sensors, all of fuel injectors(some twice, they seem to last about 2 years), fuel pump, TCS, injector harness, knock sensors, knock sensor harness, oil pressure sending unit, upper front control arms, front radial arms, front struts, two rear calipers(they were sticking), water pump, rack & pinion mounting isolators, tie rod ends, water pump, transmission temp. sensor, valve cover gaskets, cleaned throttle bore(a few times), cleaned ICS( a few times), rack boots, alternator tensioner pulley(other pulley are due soon). Will probably change coil harnesses, the next time I have to check the spark plugs. Will probably change ECU temp. sensor soon.

[elwesso]

How much did they charge you for that? Because if you paid more than like $300 (3 hours @ $100?)... All of those hoses should be like $10 at the VERY most (going from memory)

I cant find that last part number in my parts book... But those 2 hoses I dont even think you have to take the plenum off..

If you paid anything around $500 or more you got ripped HARDCORE, because theres about 25 hoses totaling to about $600 that you CAN replace...

Please elaborate Dimitri, I have a sneaky suspicion you got taken for a walk with a choke chain.

[mtcookson]

Have a 90 and a 92 and the hoses are very hard on both. 130k miles on the 90, right over 200k on the 92.

[ddrumman]

How much did they charge you for that? Because if you paid more than like $300 (3 hours @ $100?)... All of those hoses should be like $10 at the VERY most (going from memory)

I cant find that last part number in my parts book... But those 2 hoses I dont even think you have to take the plenum off..

If you paid anything around $500 or more you got ripped HARDCORE, because theres about 25 hoses totaling to about $600 that you CAN replace...

Please elaborate Dimitri, I have a sneaky suspicion you got taken for a walk with a choke chain.

Well! I was charged 7 hours of labor for the install of injectors #5,6 and 7 plus the above mentioned hoses.

And, you're saying these hoses that were replaced are NOT part of the "plenum job"?

Also, I'll have to check the price of these hoses from IOS.

[elwesso]

ok... that makes more sense.. I thought you had them just do the plenum hoses!!! I forgot you did the injectors.. They probably just broke those hoses getting the plenum off, not really an issue.

Sorry to get you worried. 7 hours is a bit steep IMO if they only had to replace 3 hoses, that means the plenum came off fairly easy.. Its hard to say...

[ddrumman]

I just saw this http://www.trademotion.com/par...=3221 at IOS and I DO see the 8 gaskets that I stated a few posts above. And yeah... they (Infiniti of Thousand Oaks) charged me quite a few more ($7 per) for them. I'll try to get some of it back.

My question is: is this kit applicable to 94-96 Qs or just first gen? Also I didn't see the other 3 that I mentioned above on this IOS list.
Modified by ddrumman at 1:25 AM 1/1/2008

[elwesso]

94-96 is first gen.

[ddrumman]

94-96 is first gen.

I understand, and did you see that link? It just says, that particular kit is for 90-93.

[elwesso]

You would just tell Joe that you want that thing for a 94. Its going to be pretty much the same.. You're gonna need coolant hoses too (those are only the PCV hoses)

[ddrumman]

You know, part# 1403260U01 which I got 8 of, exists in my receipt and at Joe's. However, parts# 1405660U05, 1405660U04 and 1405660U00 which I paid for, and are in my receipt are NOT on the website. Could those be the coolant hoses you're referring to?


Modified by ddrumman at 10:56 PM 1/1/2008

[mxr662]

The vacuum line connected to the fuel rail was cracked. The PVC hoses were very hard. The heater hoses and radiator hoses made a crackle noise when flexed but then became soft. Most of the hoses that connected directly to the plenum were somewhat hard. Replacing them made installing the plenum much, much easier.

[bullittandy]

Just to add some info about 97+ Q45's. I've read alot about the hoses needing to be replaced on earlier Q's which I though was weird since the hoses/vacuum lines on my 97 (235K miles) are soft and pliable-not even close to hard/stiff.

Seems like it could be an improvement? I use to own a 1966 Lincoln Continental and replaced some vacuum hoses but learned an important lesson-"if it ain't leakin, don't replace it." I made as many new vacuum leaks as prevented new ones!!

[qship96]

Would be interesting to compare{measure} underhood temperatures to see if 94-96 are lower due to addition of the grill and lower bumper air inlets as compared to the 90-93=this may explain hose longevity differences between the 2 groups

[ddrumman]

You would just tell Joe that you want that thing for a 94. Its going to be pretty much the same.. You're gonna need coolant hoses too (those are only the PCV hoses)

You know, part# 1403260U01 which I got 8 of, exists in my receipt and at Joe's. However, parts# 1405660U05, 1405660U04 and 1405660U00 which I paid for, and are in my receipt are NOT on the website. Could those be the coolant hoses you're referring to?



Modified by ddrumman at 10:56 PM 1/1/2008

I just spoke to Cheryl at IOS and she has ALL of those except the #1405660U04. The rest she said are part of the "Coolant Bypass Hose Kit". Also, the price was quite a bit less that ITO.

So, now all I've got to do is, get the "Plenum Kit", "Coolant Bypass Hose Kit" minus the 11 hoses that I just got and that should be it. Right?

[jamesmost]

mine were all supple but replaced most all of them any way

[pabs324]

how many hoses should i expect to change and what are they?

[AlabamaDan]

Flame me if you will, but I haven't changed mine. :gasp I'm hoping for the best.

[Haitian_King]

Shoot. Me neither Dan. But I just added the Under Plenum Hose Kit to my shopping cart along with the Chain Guide Kit. $673.51 + $69.03 for shipping.

Now to factor in the cost of labor. If it takes Keith the 10 hours for the chain guides, I'm looking at $850 for that. I'm trying to get a ton of stuff done at once to save on labor time. VC gaskets and the hoses. I'm debating on whether to add the transmission and engine mounts + exhaust hangers on too or to save them for the next pay period. Thoughts?

God. I can't tell anyone about this. I'm about to spend $1592.54 on the Q very soon, and that's just a ballpark. I don't know if there will be an extra labor charge for the VC reseal and hose replacements if Keith does it. Not to mention, the cost of a car rental for a week. I don't think any of my friends would understand.

I guess I'm just Qrazy.

[96Qowner]

The transmission mount and exhaust hangers are easy and not really related to anything else - do them whenever you have the bucks - actually, I recommend doing them ASAP - you'll notice the difference in vibration. The 2 front motor mounts require disassembly of the suspension members, so do them when you do the front suspension.

[Haitian_King]

The transmission mount and exhaust hangers are easy and not really related to anything else - do them whenever you have the bucks - actually, I recommend doing them ASAP - you'll notice the difference in vibration. The 2 front motor mounts require disassembly of the suspension members, so do them when you do the front suspension.

Would adding them to the current job add anymore in labor hours? The transmission mounts and exhaust hangers? I guess I'll save the engine mounts for when the suspension work begins. Or if I have to drop the oil pan to get guide pieces out. (Hope not)

Still, I'm looking at close to $1600 for this job. But the way the Q drove this morning justifies it to me. I love it. It performed beautifully and I want it to continue. Forever. I parked it in front of Wawa this morning while I went in to get coffee. I came out and it was still glistening with water from morning dew and a light shower from the night before. I fell in love. Again. The car looked so low, I had to check the tires to make sure they were full. Could it be possible that my car has lowering springs? I've never really looked.

god, I love this car.

Sorry for the school-girl gushing.

[96Qowner]

Would adding them to the current job add anymore in labor hours? The transmission mounts and exhaust hangers?

Maybe an hour in labor - 2-300 in parts. But if you have NO vibration at 45 and 65mph, no need to hurry on it.

[Haitian_King]

Hmm. I have driveshaft vibration from a full stop. So I have no idea if the transmission mounts are vibrating too. I have a feeling that they need to be replaced anyway. I haven't found any sort of indication of their replacement in the Service records. Then again, there's a whole 65k miles gap where I don't know what the hell happened until I got it.

*EDIT*

The Rear engine mount on Infinitpartsusa.com is the transmission mount right? For the $120.88, do I get the pair? Or is that just the price for 1? Would I be looking at $241.76?

This changes my end cost to $1798.42 if I only pay the $120.88 once and $1919.30 if the transmission mounts don't come in pairs. Then, if I budget about $200 for a week's car rental, I'm looking at $2119.30 or $1998.42

Damn.
Modified by Haitian_King at 2:14 PM 2/23/2008

[qship96]

Get a pair of transmission mounts,then send one to me !!!

Are you finally budgeting for those chain guides in your above calculations???