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LQ1 reliability? by kawana
Started on: 09-13-2013 12:52 AM
Replies: 17 (1541 views)
Last post by: chetw77cruiser on 09-14-2013 09:06 PM
kawana
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Report this Post09-13-2013 12:52 AM Click Here to See the Profile for kawanaClick Here to visit kawana's HomePageClick Here to Email kawanaSend a Private Message to kawanaEdit/Delete MessageReply w/QuoteDirect Link to This Post
I recently got back into the Fiero world, and im looking to do a motor swap. I have an opportunity at getting an LQ1 for a steal of a deal, but I seem to recall reading about some reliabilty issues with the engine, but I cant for the life of me remember what is was, or where I read it. Anyone have any info on the subject?
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masospaghetti
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Report this Post09-13-2013 10:37 AM Click Here to See the Profile for masospaghettiClick Here to Email masospaghettiSend a Private Message to masospaghettiEdit/Delete MessageReply w/QuoteDirect Link to This Post
The LQ1 is not necessarily a unreliable engine, but it is a high maintenance one. Spark plug changes require removal of the upper intake, and the engine uses a timing chain as well as two timing belts. The belts have a fixed change interval and the replacement procedure is complicated.

If you can get one cheap in good shape, do the maintenance before you install it and you will be fine for a long time. I doubt a timing belt change is difficult with the engine out of the car. It was a very highly engineered engine for its time and makes impressive power. GM really went all out on it, performance wise. IIRC, they had to neuter it from the factory so it wouldn't destroy the transmission because it put out too much power - you can get this power back by changing the cam timing.

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tesmith66
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Report this Post09-13-2013 11:40 AM Click Here to See the Profile for tesmith66Send a Private Message to tesmith66Edit/Delete MessageReply w/QuoteDirect Link to This Post
Spark plug changes DO NOT require removal of anything and it only has one timing belt and one timing chain.

They are no less reliable than any other GM FWD V6.
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carbon
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Report this Post09-13-2013 11:54 AM Click Here to See the Profile for carbonSend a Private Message to carbonEdit/Delete MessageReply w/QuoteDirect Link to This Post
Just make sure you do long life spark plugs and the timing belt while it is out of the car and you'll be golden.
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kawana
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Report this Post09-13-2013 08:09 PM Click Here to See the Profile for kawanaClick Here to visit kawana's HomePageClick Here to Email kawanaSend a Private Message to kawanaEdit/Delete MessageReply w/QuoteDirect Link to This Post
Oh, well heck, if thats what all the fuss is about, im not too worried. 1 more question, is the LQ1 an interference engine?
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MstangsBware
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Report this Post09-13-2013 08:46 PM Click Here to See the Profile for MstangsBwareClick Here to Email MstangsBwareSend a Private Message to MstangsBwareEdit/Delete MessageReply w/QuoteDirect Link to This Post
I can tell u the DOHC attached to a 5 speed is a blast to drive. Just got one on the road and love driving it.
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fieroguru
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Report this Post09-13-2013 09:58 PM Click Here to See the Profile for fieroguruSend a Private Message to fieroguruEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by kawana:
1 more question, is the LQ1 an interference engine?


Yes... many engines out there with bent valves due to not replacing the belt before it broke.

I had an opportunity to drive a 3.4TDC/getrag car and shifting at 7K was quite addictive. I was used to driving Fieros with more power, but really liked the powerband. It was probably the main reason I gave my LS4 swap a 7K power band.
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qwikgta
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Report this Post09-13-2013 10:19 PM Click Here to See the Profile for qwikgtaClick Here to Email qwikgtaSend a Private Message to qwikgtaEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by tesmith66:

Spark plug changes DO NOT require removal of anything and it only has one timing belt and one timing chain.

They are no less reliable than any other GM FWD V6.


Not true. I had an 96 motor and YOU DID need to remove the intake manifold to swap the plugs. Get your facts straight.

RJ
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MstangsBware
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Report this Post09-13-2013 10:49 PM Click Here to See the Profile for MstangsBwareClick Here to Email MstangsBwareSend a Private Message to MstangsBwareEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by fieroguru:


Yes... many engines out there with bent valves due to not replacing the belt before it broke.

I had an opportunity to drive a 3.4TDC/getrag car and shifting at 7K was quite addictive. I was used to driving Fieros with more power, but really liked the powerband. It was probably the main reason I gave my LS4 swap a 7K power band.


I can agree with Guru on this one. I am used to driving higher HP 3800SC swapped Fieros but the powerband coupled with the 7k shifts make this motor a blast to drive. I drive the car ever chance I get and plan on swapping a DOHC into an 88 GT I have in the future once I sell the current one.
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Sourmug
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Report this Post09-14-2013 02:05 AM Click Here to See the Profile for SourmugSend a Private Message to SourmugEdit/Delete MessageReply w/QuoteDirect Link to This Post
I love mine!

[This message has been edited by Sourmug (edited 09-14-2013).]

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kawana
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Report this Post09-14-2013 02:49 AM Click Here to See the Profile for kawanaClick Here to visit kawana's HomePageClick Here to Email kawanaSend a Private Message to kawanaEdit/Delete MessageReply w/QuoteDirect Link to This Post
Glad to hear your guys opinions! I have a chance at getting one for $50, but its 3 hours away, and stripped down. But for that price, Itd be worth it. Plus I can use this as an opportunity to get the motor freshened up before it gets put back together.
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Report this Post09-14-2013 07:06 AM Click Here to See the Profile for Silicoan86Click Here to Email Silicoan86Send a Private Message to Silicoan86Edit/Delete MessageReply w/QuoteDirect Link to This Post
The 91-95 engines are NOT inference engines, the belt on mine broke at 4500 rpm getting on the freeway under the previous owner's care. No damage to anything at all. An old friend of mine's dohc Fiero did the same thing and it was fine as well. I have read that the 96-97 engines may be interference, but I have not seen evidence to confirm this.

When you change the belt, do the idler pulleys as well. I changed mine in the car, it was pretty easy to do, but I always seem to have less trouble when working in tight spaces than most people.

The spark plugs on the 91-95 motors can be changed without removing any intake parts. The 96-97 motors require removal of the upper intake plenum to access the rear bank.

[This message has been edited by Silicoan86 (edited 09-14-2013).]

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tesmith66
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Report this Post09-14-2013 08:54 AM Click Here to See the Profile for tesmith66Send a Private Message to tesmith66Edit/Delete MessageReply w/QuoteDirect Link to This Post
Looks like I got my facts a little crooked. On the two LQ1 motors that I own (91-95 style), the intake need not be removed to change plugs.

And yes, 7000 RPM shifting is fun.

------------------
1986 SE Aero coupe.

3.4 DOHC swap is complete and running, now just have to finish the rest of the car...

[This message has been edited by tesmith66 (edited 09-14-2013).]

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Tony Kania
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Report this Post09-14-2013 09:34 AM Click Here to See the Profile for Tony KaniaSend a Private Message to Tony KaniaEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Sourmug:

I love mine!





This.

They make an amazing sound when accelerating away!
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chetw77cruiser
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Report this Post09-14-2013 03:51 PM Click Here to See the Profile for chetw77cruiserSend a Private Message to chetw77cruiserEdit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks a lot guys. Because of all this talk about the 3.4 DOHC, I am second guessing the idea of installing a 4.9 one of my cars.
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MstangsBware
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Report this Post09-14-2013 07:48 PM Click Here to See the Profile for MstangsBwareClick Here to Email MstangsBwareSend a Private Message to MstangsBwareEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
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Originally posted by chetw77cruiser:

Thanks a lot guys. Because of all this talk about the 3.4 DOHC, I am second guessing the idea of installing a 4.9 one of my cars.


If putting on a 5 speed then I would hands down.
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Steven Snyder
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Report this Post09-14-2013 07:52 PM Click Here to See the Profile for Steven SnyderClick Here to visit Steven Snyder's HomePageClick Here to Email Steven SnyderSend a Private Message to Steven SnyderEdit/Delete MessageReply w/QuoteDirect Link to This Post
Just put iridium spark plugs in it and "never" worry about changing them. Around 60k on mine and they're still perfect. Change them along with the timing belt and pulleys when the motor is out for clutch replacement, or do it before you put the motor in and leave them forever. They last over 100k miles.

[This message has been edited by Steven Snyder (edited 09-09-2014).]

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chetw77cruiser
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Report this Post09-14-2013 09:06 PM Click Here to See the Profile for chetw77cruiserSend a Private Message to chetw77cruiserEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by MstangsBware:


If putting on a 5 speed then I would hands down.


So you feel that I should go with the LQ1 vs the 4.9? Do tell. I have been leaning that way, but figured the 4.9 would be a better engine for driving in the mountains.

I do have an NVG-T550 (internal Hydraulic TOB) and several v6 4 speeds to chose from. I just need to replace/fix the oil pan. The drain plug mount was damaged when the hoist tipped forward. I could probably braze it and be good.

[This message has been edited by chetw77cruiser (edited 09-14-2013).]

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